diff --git a/backend/app/config.py b/backend/app/config.py
index 7c3bc65..01c1d8f 100644
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -23,8 +23,6 @@ class Config:
     DESCRIPTION = 'System PRI'
     OPENAPI_VERSION = '3.0.2'
 
-    PROJECT_PRESENTATION_TIME = 30  # in minutes
-
 
 class ProductionConfig(Config):
     DB_SERVER = "0.0.0.0"
diff --git a/backend/app/coordinator/routes/__init__.py b/backend/app/coordinator/routes/__init__.py
index d796e0d..a99b85a 100644
--- a/backend/app/coordinator/routes/__init__.py
+++ b/backend/app/coordinator/routes/__init__.py
@@ -1,7 +1,7 @@
 from flask import Blueprint
 
 from .examination_schedule import bp as examination_schedule_bp
-# from .enrollments import bp as enrollments_bp
+from .enrollments import bp as enrollments_bp
 from .groups import bp as groups_bp
 from .project_supervisor import bp as project_supervisor_bp
 from .students import bp as students_bp
@@ -15,5 +15,5 @@ bp.register_blueprint(project_supervisor_bp)
 bp.register_blueprint(groups_bp)
 bp.register_blueprint(year_group_bp)
 bp.register_blueprint(examination_schedule_bp)
-# bp.register_blueprint(enrollments_bp)
+bp.register_blueprint(enrollments_bp)
 # bp.register_blueprint(workloads_bp)
diff --git a/backend/app/coordinator/routes/enrollments.py b/backend/app/coordinator/routes/enrollments.py
index 10174eb..6a58888 100644
--- a/backend/app/coordinator/routes/enrollments.py
+++ b/backend/app/coordinator/routes/enrollments.py
@@ -1,69 +1,174 @@
 import datetime
 
 from apiflask import APIBlueprint
-from flask import abort, current_app
+from flask import abort
+from sqlalchemy import or_, and_
 
-from ..schemas import MessageSchema, EnrollmentCreateSchema
-from ...examination_schedule.models import ExaminationSchedule
+from ..schemas import MessageSchema, TermOfDefenceSchema, TermOfDefenceListSchema, \
+    TemporaryAvailabilityListSchema
+from ...examination_schedule.models import ExaminationSchedule, TermOfDefence, TemporaryAvailability
+from ...students.models import YearGroup
+from ...project_supervisor.models import ProjectSupervisor
 from ...dependencies import db
 
 bp = APIBlueprint("enrollments", __name__, url_prefix="/enrollments")
 
 
-@bp.post('/<int:examination_schedule_id>/')
-@bp.input(EnrollmentCreateSchema, location='json')
-@bp.output(MessageSchema)
-def create_enrollments(examination_schedule_id: int, data: dict) -> dict:
-    prt = current_app.config["PROJECT_PRESENTATION_TIME"]
+@bp.post('/<int:examination_schedule_id>/generate')
+def generate_term_of_defence_for_this_examination_schedule(examination_schedule_id: int) -> dict:
+    pass
 
-    examination_schedule = db.session.query(ExaminationSchedule).filter(
-        ExaminationSchedule.id == examination_schedule_id).first()
-    if examination_schedule is None:
-        abort(404, "Examination schedule doesn't exist!")
+
+@bp.post('/<int:examination_schedule_id>/add')
+@bp.input(TermOfDefenceSchema)
+@bp.output(MessageSchema)
+def create_term_of_defence(examination_schedule_id: int, data: dict) -> dict:
+    if not data:
+        abort(400, "You have passed empty data!")
+
+    ex = ExaminationSchedule.query.filter(ExaminationSchedule.id == examination_schedule_id).first()
+    if ex is None:
+        abort(404, "Not found examination schedule!")
+
+    yg_id = ex.year_group_id
+    project_supervisors_ids = data.pop('project_supervisors')
+    project_supervisors = ProjectSupervisor.query.filter(
+        or_(*[ProjectSupervisor.id == i for i in project_supervisors_ids])).filter(YearGroup.id == yg_id).all()
+
+    if len(project_supervisors) != len(project_supervisors_ids):
+        abort(404, "Project Supervisors didn't exist!")
 
     start_date = data['start_date']
     end_date = data['end_date']
-    if start_date > end_date:
-        abort(400, "Invalid dates! End date must be greater than start date!")
-    if start_date.date() != end_date.date():
-        abort(400, "Invalid dates! Only hours can be different!")
 
-    enrollment = Enrollment.query.filter(Enrollment.start_date >= start_date,
-                                         Enrollment.start_date < end_date).first()
-    if enrollment is not None:
-        abort(400, "You have just created enrollments for this range date!")
+    if not (ex.start_date.timestamp() < start_date.timestamp() and ex.end_date.timestamp() > end_date.timestamp()):
+        abort(400, "Invalid date range!")
 
-    enrollment = Enrollment.query.filter(Enrollment.end_date > start_date, Enrollment.end_date <= end_date).first()
-    if enrollment is not None:
-        abort(400, "You have just created enrollments for this range date! `1")
+    if end_date <= start_date:
+        abort(400, "End date must be greater than start date!")
 
-    delta = end_date - start_date
-    delta_in_minutes = delta.total_seconds() / 60
-    if delta_in_minutes % prt != 0:
-        abort(400, "Invalid format dates!")
+    delta_time = end_date - start_date
+    delta_time_in_minutes = delta_time.total_seconds() / 60
+    if delta_time_in_minutes != ex.duration_time:
+        abort(400, "Invalid duration time!")
 
-    amount = int(delta_in_minutes // prt)
-    enrollments = []
-    for i in range(amount):
-        sd = start_date + datetime.timedelta(minutes=i * prt)
-        ed = start_date + datetime.timedelta(minutes=(i + 1) * prt)
-        enrollment = Enrollment(start_date=sd, end_date=ed, examination_schedule_id=examination_schedule_id)
-        enrollments.append(enrollment)
-    db.session.add_all(enrollments)
+    td = TermOfDefence.query.filter(TermOfDefence.examination_schedule_id == examination_schedule_id). \
+        filter(
+        or_(and_(TermOfDefence.start_date >= start_date,
+                 TermOfDefence.start_date < end_date,
+                 TermOfDefence.end_date >= end_date),
+            and_(TermOfDefence.start_date <= start_date,
+                 TermOfDefence.end_date > start_date,
+                 TermOfDefence.end_date <= end_date))).first()
+
+    if td is not None:
+        abort(400, "This term of defence is taken! You choose other date!")
+
+    td = TermOfDefence(**data, examination_schedule_id=examination_schedule_id)
+    db.session.add(td)
     db.session.commit()
-
-    committees = [Committee(enrollment_id=e.id) for e in enrollments]
-    db.session.add_all(committees)
+    for p in project_supervisors:
+        td.members_of_committee.append(p)
     db.session.commit()
-    return {"message": "Enrollments was created!"}
+    return {"message": "Term of defence was created!"}
 
 
-@bp.delete('/<int:enrollment_id>/')
+@bp.put('/<int:examination_schedule_id>/update/<int:term_of_defence_id>/')
+@bp.input(TermOfDefenceSchema)
 @bp.output(MessageSchema)
-def delete_enrollment(enrollment_id: int) -> dict:
-    enrollment = db.session.query(Enrollment).filter(Enrollment.id == enrollment_id).first()
-    if enrollment is None:
-        abort(404, "Enrollment doesn't exist!")
-    db.session.delete(enrollment)
+def update_term_of_defence(examination_schedule_id: int, term_of_defence_id: int, data: dict) -> dict:
+    if not data:
+        abort(400, "You have passed empty data!")
+
+    td_query = TermOfDefence.query.filter(TermOfDefence.id == term_of_defence_id,
+                                          TermOfDefence.examination_schedule_id == examination_schedule_id)
+    td = td_query.first()
+    if td is None:
+        abort(404, "Not found term of defence!")
+
+    ex = td.examination_schedule
+    yg_id = ex.year_group_id
+    project_supervisors_ids = data.pop('project_supervisors')
+    project_supervisors = ProjectSupervisor.query.filter(
+        or_(*[ProjectSupervisor.id == i for i in project_supervisors_ids])).filter(YearGroup.id == yg_id).all()
+
+    if len(project_supervisors) != len(project_supervisors_ids):
+        abort(404, "Project Supervisors didn't exist!")
+
+    start_date = data['start_date']
+    end_date = data['end_date']
+
+    if not (ex.start_date.timestamp() < start_date.timestamp() and ex.end_date.timestamp() > end_date.timestamp()):
+        abort(400, "Invalid date range!")
+
+    if end_date <= start_date:
+        abort(400, "End date must be greater than start date!")
+
+    delta_time = end_date - start_date
+    delta_time_in_minutes = delta_time.total_seconds() / 60
+    if delta_time_in_minutes != ex.duration_time:
+        abort(400, "Invalid duration time!")
+
+    term_of_defence = TermOfDefence.query.filter(TermOfDefence.id != term_of_defence_id,
+                                    TermOfDefence.examination_schedule_id == examination_schedule_id). \
+        filter(
+        or_(and_(TermOfDefence.start_date >= start_date,
+                 TermOfDefence.start_date < end_date,
+                 TermOfDefence.end_date >= end_date),
+            and_(TermOfDefence.start_date <= start_date,
+                 TermOfDefence.end_date > start_date,
+                 TermOfDefence.end_date <= end_date))).first()
+
+    if term_of_defence is not None:
+        abort(400, "This term of defence is taken! You choose other date!")
+
+    td_query.update(data)
+    td.members_of_committee = []
     db.session.commit()
-    return {"message": "Enrollment was deleted!"}
+    for p in project_supervisors:
+        td.members_of_committee.append(p)
+    db.session.commit()
+
+    return {"message": "Term of defence was updated!"}
+
+
+@bp.delete('/<int:examination_schedule_id>/delete/<int:term_of_defence_id>/')
+@bp.output(MessageSchema)
+def delete_term_of_defence(examination_schedule_id: int, term_of_defence_id: int) -> dict:
+    td = TermOfDefence.query.filter(TermOfDefence.id == term_of_defence_id,
+                                    ExaminationSchedule.id == examination_schedule_id).first()
+    if td is None:
+        abort(404, "Not found term of defence!")
+
+    db.session.delete(td)
+    db.session.commit()
+
+    return {"message": "Term of defence was deleted!"}
+
+
+@bp.get('/<int:examination_schedule_id>/term-of-defences/')
+@bp.output(TermOfDefenceListSchema)
+def list_of_term_of_defences(examination_schedule_id: int) -> dict:
+    ex = ExaminationSchedule.query.filter(ExaminationSchedule.id == examination_schedule_id).first()
+    if ex is None:
+        abort(400, "Examination Schedule didn't exist")
+
+    td = TermOfDefence.query. \
+        filter(TermOfDefence.examination_schedule_id == examination_schedule_id). \
+        join(TermOfDefence.members_of_committee, isouter=True). \
+        all()
+    return {"term_of_defences": td}
+
+
+@bp.get('/<int:examination_schedule_id>/temporary-availabilities/')
+@bp.output(TemporaryAvailabilityListSchema)
+def list_of_temporary_availability(examination_schedule_id: int) -> dict:
+    ex = ExaminationSchedule.query.filter(ExaminationSchedule.id == examination_schedule_id).first()
+    if ex is None:
+        abort(400, "Examination Schedule didn't exist")
+
+    td = TemporaryAvailability.query. \
+        filter(TemporaryAvailability.examination_schedule_id == examination_schedule_id). \
+        join(TemporaryAvailability.project_supervisor). \
+        all()
+    return {"temporary_availabilities": td}
diff --git a/backend/app/coordinator/routes/examination_schedule.py b/backend/app/coordinator/routes/examination_schedule.py
index 8684444..504cefd 100644
--- a/backend/app/coordinator/routes/examination_schedule.py
+++ b/backend/app/coordinator/routes/examination_schedule.py
@@ -4,6 +4,7 @@ from apiflask import APIBlueprint
 from flask import abort, Response, make_response
 
 from ...base.utils import paginate_models
+from ...base.mode import ModeGroups
 from ...dependencies import db
 from ...examination_schedule.models import ExaminationSchedule
 from ...students.models import Group, YearGroup
@@ -37,7 +38,16 @@ def create_examination_schedule(year_group_id: int, data: dict) -> dict:
     if data['start_date'] > data['end_date']:
         abort(400, "Invalid data! End date must be greater than start date!")
 
-    examination_schedule = ExaminationSchedule(**data, year_group_id=year_group_id)
+    duration_time = None
+    if yg.mode == ModeGroups.NON_STATIONARY.value:
+        duration_time = 20
+    elif yg.mode in [ModeGroups.STATIONARY.value, ModeGroups.ENGLISH_SPEAKING_STATIONARY.value]:
+        duration_time = 30
+
+    if duration_time is None:
+        abort(400, "Invalid mode of year group!")
+
+    examination_schedule = ExaminationSchedule(**data, year_group_id=year_group_id, duration_time=duration_time)
     db.session.add(examination_schedule)
     db.session.commit()
     return {"message": "Examination schedule was created!"}
diff --git a/backend/app/coordinator/routes/workloads.py b/backend/app/coordinator/routes/workloads.py
index 34beea8..2c709f6 100644
--- a/backend/app/coordinator/routes/workloads.py
+++ b/backend/app/coordinator/routes/workloads.py
@@ -3,7 +3,7 @@ from flask import abort
 from flask_sqlalchemy import get_debug_queries
 
 from ...dependencies import db
-from ...examination_schedule.models import ExaminationSchedule, Enrollment, Committee
+from ...examination_schedule.models import ExaminationSchedule
 from ...project_supervisor.models import ProjectSupervisor
 from ..schemas import WorkloadSchema
 
diff --git a/backend/app/coordinator/routes/year_group.py b/backend/app/coordinator/routes/year_group.py
index a64320d..35f2005 100644
--- a/backend/app/coordinator/routes/year_group.py
+++ b/backend/app/coordinator/routes/year_group.py
@@ -1,6 +1,5 @@
 from flask import abort
 from apiflask import APIBlueprint
-from flask_sqlalchemy import get_debug_queries
 
 from ...students.models import YearGroup
 from ..schemas import YearGroupSchema, MessageSchema, YearGroupPaginationSchema, YearGroupQuerySchema
diff --git a/backend/app/coordinator/schemas/__init__.py b/backend/app/coordinator/schemas/__init__.py
index 12fb332..b5a0cfc 100644
--- a/backend/app/coordinator/schemas/__init__.py
+++ b/backend/app/coordinator/schemas/__init__.py
@@ -1,4 +1,4 @@
-from .enrollments import EnrollmentCreateSchema
+from .enrollments import TermOfDefenceSchema, TermOfDefenceListSchema, TemporaryAvailabilityListSchema
 from .examination_schedule import ExaminationScheduleSchema, ExaminationScheduleUpdateSchema, \
     ExaminationSchedulesPaginationSchema, ExaminationSchedulesQuerySchema, WorkloadSchema
 from .groups import GroupQuerySchema, GroupsPaginationSchema, GroupCreateSchema, GroupEditSchema
diff --git a/backend/app/coordinator/schemas/enrollments.py b/backend/app/coordinator/schemas/enrollments.py
index 7367e58..bdfd0a5 100644
--- a/backend/app/coordinator/schemas/enrollments.py
+++ b/backend/app/coordinator/schemas/enrollments.py
@@ -1,8 +1,41 @@
-from marshmallow import Schema, fields
+from marshmallow import Schema, fields, validate
 
 from ..validators import validate_datetime_greater_than_now
 
 
-class EnrollmentCreateSchema(Schema):
+class TermOfDefenceSchema(Schema):
     start_date = fields.DateTime(validate=validate_datetime_greater_than_now, required=True)
     end_date = fields.DateTime(validate=validate_datetime_greater_than_now, required=True)
+    project_supervisors = fields.List(fields.Integer(required=True), validate=validate.Length(3, 3))
+
+
+class ProjectSupervisorForTermOfDefenceSchema(Schema):
+    id = fields.Str()
+    first_name = fields.Str()
+    last_name = fields.Str()
+
+
+class TermOfDefenceItemSchema(Schema):
+    start_date = fields.DateTime()
+    end_date = fields.DateTime()
+    members_of_committee = fields.List(fields.Nested(ProjectSupervisorForTermOfDefenceSchema))
+
+
+class TermOfDefenceListSchema(Schema):
+    term_of_defences = fields.List(fields.Nested(TermOfDefenceItemSchema))
+
+
+class ProjectSupervisorForTemporaryAvailabilitySchema(Schema):
+    id = fields.Str()
+    first_name = fields.Str()
+    last_name = fields.Str()
+
+
+class TemporaryAvailabilityItemSchema(Schema):
+    start_date = fields.DateTime()
+    end_date = fields.DateTime()
+    project_supervisor = fields.Nested(ProjectSupervisorForTemporaryAvailabilitySchema)
+
+
+class TemporaryAvailabilityListSchema(Schema):
+    temporary_availabilities = fields.List(fields.Nested(TemporaryAvailabilityItemSchema))
diff --git a/backend/app/examination_schedule/models.py b/backend/app/examination_schedule/models.py
index 6b37ff8..b18e6b8 100644
--- a/backend/app/examination_schedule/models.py
+++ b/backend/app/examination_schedule/models.py
@@ -6,7 +6,7 @@ class ExaminationSchedule(Base):
     __tablename__ = 'examination_schedules'
 
     title = db.Column(db.String(100), unique=True, nullable=False)
-    duration_time = db.Column(db.Integer) # in minutes
+    duration_time = db.Column(db.Integer)  # in minutes
     start_date_for_enrollment_students = db.Column(db.DateTime)
     end_date_for_enrollment_students = db.Column(db.DateTime)
     start_date = db.Column(db.DateTime, nullable=False)
diff --git a/backend/app/examination_schedule/routes/enrollments.py b/backend/app/examination_schedule/routes/enrollments.py
deleted file mode 100644
index e01027b..0000000
--- a/backend/app/examination_schedule/routes/enrollments.py
+++ /dev/null
@@ -1,39 +0,0 @@
-import datetime
-
-from apiflask import APIBlueprint
-from flask import abort
-
-from ..schemas import EnrollmentPaginationSchema, EnrollmentQuerySchema, ExaminationScheduleProjectSupervisorViewSchema
-from ..utils import check_examination_schedule_is_exist, get_list_of_enrollments_response
-
-bp = APIBlueprint("enrollments", __name__, url_prefix="/enrollments")
-
-
-# list of the exam registration for students
-@bp.get('/<int:examination_schedule_id>/student-view')
-@bp.input(EnrollmentQuerySchema, location='query')
-@bp.output(EnrollmentPaginationSchema)
-def list_enrollments_for_students(examination_schedule_id: int, query: dict) -> dict:
-    page = query.get('page')
-    per_page = query.get('per_page')
-
-    examination_schedule = check_examination_schedule_is_exist(examination_schedule_id)
-
-    now = datetime.datetime.utcnow()
-    if examination_schedule.start_date is None or examination_schedule.end_date is None:
-        abort(403, "Forbidden! The examination schedule is not available yet")
-
-    if examination_schedule.start_date.timestamp() > now.timestamp():
-        abort(403, "Forbidden! Enrollments haven't just started!")
-
-    if examination_schedule.end_date.timestamp() < now.timestamp():
-        abort(400, "The exam registration has just finished!")
-
-    return get_list_of_enrollments_response(examination_schedule_id, page, per_page)
-
-
-@bp.get('/<int:examination_schedule_id>/coordinator-view/')
-@bp.output(ExaminationScheduleProjectSupervisorViewSchema)
-def list_enrollments_for_coordinator(examination_schedule_id: int) -> dict:
-    return check_examination_schedule_is_exist(examination_schedule_id)
-
diff --git a/backend/app/examination_schedule/routes/examination_schedule.py b/backend/app/examination_schedule/routes/examination_schedule.py
deleted file mode 100644
index aa1fcfa..0000000
--- a/backend/app/examination_schedule/routes/examination_schedule.py
+++ /dev/null
@@ -1,18 +0,0 @@
-import datetime
-
-from apiflask import APIBlueprint
-
-from ...dependencies import db
-from ..models import ExaminationSchedule
-
-bp = APIBlueprint("list_of_examination_schedule", __name__, url_prefix="/")
-
-
-@bp.get('/students-view/')
-def list_examination_schedule_for_students() -> dict:
-    # in the future filter after the mode of examination schedule if we will have authorization module
-    now = datetime.datetime.utcnow()
-    examination_schedules = db.session.query(ExaminationSchedule).\
-        filter(ExaminationSchedule.start_date_for_enrollment_students < now).\
-        filter(ExaminationSchedule.end_date_for_enrollment_students > now).all()
-    return {'examination_schedules': examination_schedules}
diff --git a/backend/app/examination_schedule/schemas.py b/backend/app/examination_schedule/schemas.py
index b7d5114..e69de29 100644
--- a/backend/app/examination_schedule/schemas.py
+++ b/backend/app/examination_schedule/schemas.py
@@ -1,39 +0,0 @@
-from marshmallow import fields, validate, Schema
-
-
-class ProjectSupervisorSchema(Schema):
-    first_name = fields.Str()
-    last_name = fields.Str()
-
-
-class CommitteeSchema(Schema):
-    members = fields.List(fields.Nested(ProjectSupervisorSchema))
-
-
-class GroupSchema(Schema):
-    name = fields.Str()
-
-
-class EnrollmentSchema(Schema):
-    id = fields.Integer()
-    start_date = fields.DateTime()
-    end_date = fields.DateTime()
-    committee = fields.Nested(CommitteeSchema)
-    group = fields.Nested(GroupSchema)
-
-
-class EnrollmentPaginationSchema(Schema):
-    enrollments = fields.List(fields.Nested(EnrollmentSchema))
-    max_pages = fields.Integer()
-
-
-class ExaminationScheduleProjectSupervisorViewSchema(Schema):
-    id = fields.Integer()
-    start_date = fields.DateTime()
-    end_date = fields.DateTime()
-
-
-class EnrollmentQuerySchema(Schema):
-    page = fields.Integer()
-    per_page = fields.Integer()
-
diff --git a/backend/app/examination_schedule/utils.py b/backend/app/examination_schedule/utils.py
index 2a283c3..e69de29 100644
--- a/backend/app/examination_schedule/utils.py
+++ b/backend/app/examination_schedule/utils.py
@@ -1,27 +0,0 @@
-from flask import abort
-
-from ..dependencies import db
-from .models import ExaminationSchedule
-from ..students.models import Group
-from ..base.utils import paginate_models
-
-
-def check_examination_schedule_is_exist(examination_schedule_id: int) -> ExaminationSchedule:
-    examination_schedule = db.session.query(ExaminationSchedule).filter(
-        ExaminationSchedule.id == examination_schedule_id).first()
-
-    if examination_schedule is None:
-        abort(404, "Examination Schedule doesn't exist!")
-
-    return examination_schedule
-
-
-def get_list_of_enrollments_response(examination_schedule_id: int, page: int = None, per_page: int = None) -> dict:
-    enrollments_query = db.session.query(Enrollment). \
-        join(Group, isouter=True).join(Committee, isouter=True). \
-        join(ExaminationSchedule, isouter=True). \
-        filter(ExaminationSchedule.id == examination_schedule_id)
-
-    data = paginate_models(page, enrollments_query, per_page)
-
-    return {"enrollments": data["items"], "max_pages": data["max_pages"]}
diff --git a/backend/app/project_supervisor/query.py b/backend/app/project_supervisor/query.py
deleted file mode 100644
index f4ee19e..0000000
--- a/backend/app/project_supervisor/query.py
+++ /dev/null
@@ -1,27 +0,0 @@
-import datetime
-
-from flask import abort
-
-from ..dependencies import db
-from ..examination_schedule.models import ExaminationSchedule
-
-
-def get_enrollment_by_enrollment_and_examination_schedule_ids(examination_schedule_id: int,
-                                                              enrollment_id: int) -> None:
-    enrollment = db.session.query(Enrollment). \
-        join(ExaminationSchedule, isouter=True).join(Committee, isouter=True). \
-        filter(ExaminationSchedule.id == examination_schedule_id). \
-        filter(Enrollment.id == enrollment_id). \
-        first()
-
-    if enrollment is None:
-        abort(404, "Examination schedule doesn't exist!")
-
-    return enrollment
-
-
-def check_the_enrollments_has_just_started(start_date: datetime.datetime, action: str) -> None:
-    now = datetime.datetime.utcnow()
-
-    if start_date is not None and start_date.timestamp() < now.timestamp():
-        abort(403, f"Forbidden! Enrollment has just started! You cannot {action} from the exam committees!")
diff --git a/backend/app/project_supervisor/routes/enrollments.py b/backend/app/project_supervisor/routes/enrollments.py
index c5fe196..2b3dcc1 100644
--- a/backend/app/project_supervisor/routes/enrollments.py
+++ b/backend/app/project_supervisor/routes/enrollments.py
@@ -4,7 +4,7 @@ from apiflask import APIBlueprint
 from flask import abort
 
 from ..schemas import MessageSchema, TimeAvailabilityCreateSchema, TemporaryProjectSupervisorSchema, \
-    ListOfFreeTimesSchema
+    ListOfFreeTimesSchema, ListOfTermOfDefenceSchema
 from ...dependencies import db
 from ..models import ProjectSupervisor
 from ...examination_schedule.models import ExaminationSchedule, TemporaryAvailability, TermOfDefence
@@ -32,7 +32,9 @@ def set_your_free_time_to_examination_schedule(examination_schedule_id: int, dat
     if sd > ed:
         abort(400, "Invalid data! End date must be greater than start date!")
 
-    if not (es.start_date >= sd and es.end_date <= ed):
+    print(es.start_date.timestamp() >= sd.timestamp())
+    print(es.end_date.timestamp() <= ed.timestamp())
+    if not (es.start_date.timestamp() <= sd.timestamp() and es.end_date.timestamp() >= ed.timestamp()):
         abort(400, "Invalid date ranges!")
 
     now = datetime.utcnow()
@@ -47,18 +49,18 @@ def set_your_free_time_to_examination_schedule(examination_schedule_id: int, dat
         # implement logic
         pass
 
-    ta = TemporaryAvailability(**data, examination_schedule_id=examination_schedule_id,
-                               project_supervisor_id=project_supervisor.id)
+    ta = TemporaryAvailability(**data, examination_schedule_id=examination_schedule_id)
     db.session.add(ta)
     db.session.commit()
 
     return {"message": "You have just assigned your free time!"}
 
 
-@bp.delete('/<int:examination_schedule_id>/enrollments/<int:id>/')
+@bp.delete('/<int:examination_schedule_id>/enrollments/<int:temporary_availability_id>/')
 @bp.input(TemporaryProjectSupervisorSchema)
 @bp.output(MessageSchema)
-def delete_your_free_time_from_examination_schedule(examination_schedule_id: int, id: int, data: dict) -> dict:
+def delete_your_free_time_from_examination_schedule(examination_schedule_id: int, temporary_availability_id: int,
+                                                    data: dict) -> dict:
     # this code will be removed
     project_supervisor = db.session.query(ProjectSupervisor).filter(ProjectSupervisor.id == data['id']).first()
     if project_supervisor is None:
@@ -66,7 +68,7 @@ def delete_your_free_time_from_examination_schedule(examination_schedule_id: int
     ################
     ta = TemporaryAvailability.query.filter(TemporaryAvailability.examination_schedule_id == examination_schedule_id,
                                             TemporaryAvailability.project_supervisor_id == project_supervisor.id,
-                                            TemporaryAvailability.id == id).first()
+                                            TemporaryAvailability.id == temporary_availability_id).first()
 
     if ta is None:
         abort(404, "Your free time doesn't exist!")
@@ -76,7 +78,7 @@ def delete_your_free_time_from_examination_schedule(examination_schedule_id: int
     return {"message": "You have just removed your free time!"}
 
 
-@bp.get('/<int:examination_schedule_id>/')
+@bp.get('/<int:examination_schedule_id>/temporary-availabilities/')
 @bp.input(TemporaryProjectSupervisorSchema, location='query')
 @bp.output(ListOfFreeTimesSchema)
 def list_enrollments_for_project_supervisor(examination_schedule_id: int, data: dict) -> dict:
@@ -92,19 +94,21 @@ def list_enrollments_for_project_supervisor(examination_schedule_id: int, data:
         abort(404, "Examination schedule doesn't exist!")
 
     now = datetime.utcnow()
-    if es.start_date_for_enrollment_students.timestamp() < now.timestamp():
+    start_date = es.start_date_for_enrollment_students
+    if start_date is not None and start_date.timestamp() < now.timestamp():
         abort(403, "Forbidden! Enrollment has just started! You cannot assign to the exam committees!")
 
     # list of your term of defences first enrollment
     ta = TemporaryAvailability.query.filter(TemporaryAvailability.examination_schedule_id == examination_schedule_id,
                                             TemporaryAvailability.project_supervisor_id == project_supervisor.id).all()
-    return ta
+    return {"free_times": ta}
 
 
 @bp.get('/<int:examination_schedule_id>/term-of-defences/')
 @bp.input(TemporaryProjectSupervisorSchema, location='query')
-@bp.output(ListOfFreeTimesSchema)
-def list_created_enrollment_by_coordinator_for_project_supervisor(examination_schedule_id: int, data: dict) -> dict:
+@bp.output(ListOfTermOfDefenceSchema)
+def list_created_term_of_defences_by_coordinator_for_project_supervisor(examination_schedule_id: int,
+                                                                        data: dict) -> dict:
     # this code will be removed
     project_supervisor = db.session.query(ProjectSupervisor).filter(ProjectSupervisor.id == data['id']).first()
     if project_supervisor is None:
@@ -118,5 +122,5 @@ def list_created_enrollment_by_coordinator_for_project_supervisor(examination_sc
     # list of your free times first enrollment
     td = TermOfDefence.query.join(TermOfDefence.members_of_committee). \
         filter(TermOfDefence.examination_schedule_id == examination_schedule_id). \
-        filter_by(project_supervisor_id=project_supervisor.id).all()
-    return td
+        filter_by(id=project_supervisor.id).all()
+    return {"term_of_defences": td}
diff --git a/backend/app/project_supervisor/schemas.py b/backend/app/project_supervisor/schemas.py
index e956ab1..e497085 100644
--- a/backend/app/project_supervisor/schemas.py
+++ b/backend/app/project_supervisor/schemas.py
@@ -15,6 +15,10 @@ class ListOfFreeTimesSchema(Schema):
     free_times = fields.List(fields.Nested(FreeTimeSchema))
 
 
+class ListOfTermOfDefenceSchema(Schema):
+    term_of_defences = fields.List(fields.Nested(FreeTimeSchema))
+
+
 class TimeAvailabilityCreateSchema(Schema):
     start_date = fields.DateTime(required=True)
     end_date = fields.DateTime(required=True)
diff --git a/backend/app/students/query.py b/backend/app/students/query.py
deleted file mode 100644
index a0f736d..0000000
--- a/backend/app/students/query.py
+++ /dev/null
@@ -1,10 +0,0 @@
-import datetime
-
-from flask import abort
-from ..examination_schedule.models import ExaminationSchedule
-
-
-def check_the_enrollments_has_just_started(es: ExaminationSchedule) -> None:
-    now = datetime.datetime.utcnow()
-    if es.start_date is None or es.end_date is None or not (es.start_date < now < es.end_date):
-        abort(403, "Forbidden! Enrollment hasn't started yet.")
diff --git a/backend/app/students/routes/__init__.py b/backend/app/students/routes/__init__.py
index e34d84d..561045e 100644
--- a/backend/app/students/routes/__init__.py
+++ b/backend/app/students/routes/__init__.py
@@ -2,8 +2,10 @@ from flask import Blueprint
 
 from .enrollments import bp as enrollments_bp
 from .registrations import bp as registrations_bp
+from .year_group import bp as year_group_bp
 
 bp = Blueprint("students", __name__, url_prefix="/students")
 
-bp.register_blueprint(registrations_bp)
 bp.register_blueprint(enrollments_bp)
+bp.register_blueprint(registrations_bp)
+bp.register_blueprint(year_group_bp)
diff --git a/backend/app/students/routes/enrollments.py b/backend/app/students/routes/enrollments.py
index 2293d2a..b970857 100644
--- a/backend/app/students/routes/enrollments.py
+++ b/backend/app/students/routes/enrollments.py
@@ -3,7 +3,8 @@ import datetime
 from apiflask import APIBlueprint
 from flask import abort
 
-from ..schemas import MessageSchema, TemporaryStudentSchema, ExaminationScheduleListSchema
+from ..schemas import MessageSchema, TemporaryStudentSchema, ExaminationScheduleListSchema, \
+    TermOfDefenceStudentListSchema
 from ...dependencies import db
 from ..models import Student, Group, TermOfDefence
 from ...examination_schedule.models import ExaminationSchedule
@@ -12,33 +13,39 @@ from ...project_supervisor.models import ProjectSupervisor
 bp = APIBlueprint("enrollments", __name__, url_prefix="/")
 
 
-@bp.post('/<int:examination_schedule_id>/enrollments/<int:enrollment_id>/')
+@bp.post('/<int:examination_schedule_id>/enrollments/<int:term_of_defence_id>/')
 @bp.input(TemporaryStudentSchema)
 @bp.output(MessageSchema)
-def assign_your_group_to_term_of_defence(examination_schedule_id: int, data: dict) -> dict:
+def assign_your_group_to_term_of_defence(examination_schedule_id: int, term_of_defence_id: int, data: dict) -> dict:
     # this code will be removed
     student = Student.query.filter(Student.index == data['student_index']).first()
     if student is None:
         abort(404, "Student doesn't exist!")
     ################
+    term_of_defence = TermOfDefence.query.filter(TermOfDefence.id == term_of_defence_id,
+                                                 TermOfDefence.examination_schedule_id == examination_schedule_id).first()
+
+    if term_of_defence is None:
+        abort(400, "Term of defence not found!")
+
     st = Student.query.join(Group).join(ProjectSupervisor).filter(Student.index == student.index).first()
-    if st is None or st.group.project_supervisor is None:
+    if st is None or st.groups.project_supervisor is None:
         abort(400, "You don't have a group or your group doesn't have an assigned project supervisor!")
 
-    defence = TermOfDefence.query.filter(TermOfDefence.group_id == st.group.id,
+    defence = TermOfDefence.query.filter(TermOfDefence.group_id == st.groups.id,
                                          TermOfDefence.examination_schedule_id == examination_schedule_id).first()
     if defence is not None:
         abort(400, "Your group has already assigned to any exam date!")
 
-    g = Group.query.filter(id=st.group_id).first()
+    g = Group.query.filter(Group.id == st.group_id).first()
     td = TermOfDefence.query.join(TermOfDefence.members_of_committee). \
-        filter_by(project_supervisor_id=g.project_supervisor_id).first()
+        filter_by(id=g.project_supervisor_id).first()
 
     if td is None:
         abort(400, "Your project supervisor is not in committee!")
 
-    defence.group_id = st.group.id
-    db.session.add(defence)
+    term_of_defence.group_id = st.groups.id
+    db.session.add(term_of_defence)
     db.session.commit()
     return {"message": "You have just assigned the group for this exam date!"}
 
@@ -59,7 +66,7 @@ def delete_your_group_from_term_of_defence(examination_schedule_id: int, term_of
     if term_of_defence is None:
         abort(404, "Term of defence doesn't exist!")
 
-    if student.group.id != term_of_defence.group_id:
+    if student.groups.id != term_of_defence.group_id:
         abort(400, "You are not assigned to this group!")
 
     term_of_defence.group_id = None
@@ -70,9 +77,9 @@ def delete_your_group_from_term_of_defence(examination_schedule_id: int, term_of
 
 
 @bp.get('/examination-schedule/year-group/<int:year_group_id>/')
-@bp.input(TemporaryStudentSchema)
+@bp.input(TemporaryStudentSchema, location='query')
 @bp.output(ExaminationScheduleListSchema)
-def list_examination_schedule_for_students(year_group_id: int, data: dict) -> dict:
+def list_examination_schedule(year_group_id: int, data: dict) -> dict:
     # this code will be removed
     student = Student.query.filter(Student.index == data['student_index']).first()
     if student is None:
@@ -88,10 +95,10 @@ def list_examination_schedule_for_students(year_group_id: int, data: dict) -> di
     return {'examination_schedules': examination_schedules}
 
 
-@bp.get('/enrollments/')
-@bp.input(TemporaryStudentSchema)
-@bp.output(ExaminationScheduleListSchema)
-def list_term_of_defences_for_students(data: dict) -> dict:
+@bp.get('/examination-schedule/<int:examination_schedule_id>/enrollments/')
+@bp.input(TemporaryStudentSchema, location='query')
+@bp.output(TermOfDefenceStudentListSchema)
+def list_term_of_defences(examination_schedule_id: int, data: dict) -> dict:
     # this code will be removed
     student = Student.query.filter(Student.index == data['student_index']).first()
     if student is None:
@@ -99,9 +106,9 @@ def list_term_of_defences_for_students(data: dict) -> dict:
     ################
     # in the future filter after the mode of examination schedule if we will have authorization module
     now = datetime.datetime.utcnow()
-    term_of_defences = TermOfDefence.query.join(ExaminationSchedule, isouter=True). \
+    term_of_defences = TermOfDefence.query.filter(TermOfDefence.examination_schedule_id == examination_schedule_id). \
+        join(ExaminationSchedule, isouter=True). \
         filter(ExaminationSchedule.start_date_for_enrollment_students < now). \
-        filter(ExaminationSchedule.end_date_for_enrollment_students > now). \
-        filter(TermOfDefence.group_id == student.group_id). \
-        all()
-    return {'examination_schedules': term_of_defences}
+        filter(ExaminationSchedule.end_date_for_enrollment_students > now).all()
+
+    return {'term_of_defences': term_of_defences}
diff --git a/backend/app/students/routes/year_group.py b/backend/app/students/routes/year_group.py
new file mode 100644
index 0000000..fc18477
--- /dev/null
+++ b/backend/app/students/routes/year_group.py
@@ -0,0 +1,32 @@
+from apiflask import APIBlueprint
+from flask import abort
+
+from ...students.models import YearGroup
+from ...dependencies import db
+from ...base.utils import paginate_models
+from ..schemas import YearGroupQueryStudentSchema, YearGroupStudentPaginationSchema
+from ..models import Student
+
+bp = APIBlueprint("year_group", __name__, url_prefix="/year-group")
+
+
+@bp.get('/')
+@bp.input(YearGroupQueryStudentSchema, location='query')
+@bp.output(YearGroupStudentPaginationSchema)
+def list_of_year_groups(query: dict) -> dict:
+    index = query.get('index')
+    st = Student.query.filter(Student.index == index).first()
+    if st is None:
+        abort(404, "Not found student!")
+    ####################################
+    page = query.get('page')
+    per_page = query.get('per_page')
+
+    year_group_query = YearGroup.query.join(YearGroup.students). \
+        filter(Student.index == st.index).order_by(db.desc(YearGroup.created_at))
+    data = paginate_models(page, year_group_query, per_page)
+
+    return {
+        "year_groups": data['items'],
+        "max_pages": data['max_pages']
+    }
diff --git a/backend/app/students/schemas.py b/backend/app/students/schemas.py
index 6a70137..17bd64e 100644
--- a/backend/app/students/schemas.py
+++ b/backend/app/students/schemas.py
@@ -35,3 +35,30 @@ class ExaminationScheduleSchema(Schema):
 
 class ExaminationScheduleListSchema(Schema):
     examination_schedules = fields.List(fields.Nested(ExaminationScheduleSchema))
+
+
+class TermOfDefenceStudentItemSchema(Schema):
+    id = fields.Integer()
+    start_date = fields.DateTime()
+    end_date = fields.DateTime()
+
+
+class TermOfDefenceStudentListSchema(Schema):
+    term_of_defences = fields.List(fields.Nested(TermOfDefenceStudentItemSchema))
+
+
+class YearGroupStudentSchema(Schema):
+    id = fields.Integer()
+    name = fields.Str()
+    mode = fields.Str()
+
+
+class YearGroupStudentPaginationSchema(Schema):
+    year_groups = fields.List(fields.Nested(YearGroupStudentSchema))
+    max_pages = fields.Integer()
+
+
+class YearGroupQueryStudentSchema(Schema):
+    index = fields.Integer(required=True)  # it will be removed
+    page = fields.Integer()
+    per_page = fields.Integer()