diff --git a/backend/app/project_supervisor/routes/enrollments.py b/backend/app/project_supervisor/routes/enrollments.py
index a054fa1..9ea7d8c 100644
--- a/backend/app/project_supervisor/routes/enrollments.py
+++ b/backend/app/project_supervisor/routes/enrollments.py
@@ -1,10 +1,8 @@
-import datetime
-
 from apiflask import APIBlueprint
 from flask import abort, current_app
 
 from ..schemas import MessageSchema, CommitteeCreateSchema, TemporaryProjectSupervisorSchema
-from ...examination_schedule.models import Enrollment, Committee, ExaminationSchedule
+from ...examination_schedule.models import Committee
 from ...dependencies import db
 from ..models import ProjectSupervisor
 from ..query import get_enrollment_by_enrollment_and_examination_schedule_ids, \
diff --git a/backend/app/students/query.py b/backend/app/students/query.py
new file mode 100644
index 0000000..a0f736d
--- /dev/null
+++ b/backend/app/students/query.py
@@ -0,0 +1,10 @@
+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 b3098d7..e34d84d 100644
--- a/backend/app/students/routes/__init__.py
+++ b/backend/app/students/routes/__init__.py
@@ -1,7 +1,9 @@
 from flask import Blueprint
 
+from .enrollments import bp as enrollments_bp
 from .registrations import bp as registrations_bp
 
 bp = Blueprint("students", __name__, url_prefix="/students")
 
-bp.register_blueprint(registrations_bp)
\ No newline at end of file
+bp.register_blueprint(registrations_bp)
+bp.register_blueprint(enrollments_bp)
diff --git a/backend/app/students/routes/enrollments.py b/backend/app/students/routes/enrollments.py
new file mode 100644
index 0000000..2b6fe9c
--- /dev/null
+++ b/backend/app/students/routes/enrollments.py
@@ -0,0 +1,64 @@
+import datetime
+
+from apiflask import APIBlueprint
+from flask import abort
+
+from ..schemas import MessageSchema, TemporaryStudentSchema
+from ...dependencies import db
+from ..models import Student, Group
+from ...project_supervisor.models import ProjectSupervisor
+from ...project_supervisor.query import get_enrollment_by_enrollment_and_examination_schedule_ids, \
+    check_the_project_supervisor_is_in_committee
+from ..query import check_the_enrollments_has_just_started
+
+bp = APIBlueprint("enrollments", __name__, url_prefix="/")
+
+
+@bp.post('/<int:examination_schedule_id>/enrollments/<int:enrollment_id>/')
+@bp.input(TemporaryStudentSchema)
+@bp.output(MessageSchema)
+def assign_group_for_this_exam_date(examination_schedule_id: int, enrollment_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!")
+    ################
+
+    enrollment = get_enrollment_by_enrollment_and_examination_schedule_ids(examination_schedule_id, enrollment_id)
+    check_the_enrollments_has_just_started(enrollment.examination_schedule)
+
+    st = Student.query.join(Group).join(ProjectSupervisor).filter(Student.index == student.index).first()
+    if st is None or st.group.project_supervisor is None:
+        abort(400, "You don't have a group or your group doesn't have an assigned project supervisor!")
+
+    if not check_the_project_supervisor_is_in_committee(enrollment_id, st.group.project_supervisor.id):
+        abort(400, "Your project supervisor is not in committee!")
+
+    enrollment.group_id = st.group.id
+    db.session.add(enrollment)
+    db.session.commit()
+    return {"message": "You have just assigned the group for this exam date!"}
+
+
+@bp.delete('/<int:examination_schedule_id>/enrollments/<int:enrollment_id>/')
+@bp.input(TemporaryStudentSchema)
+@bp.output(MessageSchema)
+def delete_group_for_this_exam_date(examination_schedule_id: int, enrollment_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!")
+    ################
+
+    enrollment = get_enrollment_by_enrollment_and_examination_schedule_ids(examination_schedule_id, enrollment_id)
+
+    if student.group.id != enrollment.group_id:
+        abort(400, "You are not assigned to this committee!")
+
+    check_the_enrollments_has_just_started(enrollment.examination_schedule)
+
+    enrollment.group = None
+    db.session.add(enrollment)
+    db.session.commit()
+
+    return {"message": "You have just removed the group for this exam date!"}
diff --git a/backend/app/students/schemas.py b/backend/app/students/schemas.py
index bbbe2ae..768ca22 100644
--- a/backend/app/students/schemas.py
+++ b/backend/app/students/schemas.py
@@ -1,8 +1,7 @@
-from ..dependencies import ma
-from marshmallow import fields
+from marshmallow import fields, Schema
 
 
-class ProjectSupervisorSchema(ma.Schema):
+class ProjectSupervisorSchema(Schema):
     first_name = fields.Str()
     last_name = fields.Str()
     email = fields.Str()
@@ -10,12 +9,20 @@ class ProjectSupervisorSchema(ma.Schema):
     available_groups = fields.Integer()
 
 
-class ProjectSupervisorPaginationSchema(ma.Schema):
+class ProjectSupervisorPaginationSchema(Schema):
     project_supervisors = fields.List(fields.Nested(ProjectSupervisorSchema))
     max_pages = fields.Integer()
 
 
-class ProjectSupervisorQuerySchema(ma.Schema):
+class ProjectSupervisorQuerySchema(Schema):
     page = fields.Integer()
     per_page = fields.Integer()
     mode = fields.Boolean()
+
+
+class TemporaryStudentSchema(Schema):
+    student_index = fields.Integer(required=True)
+
+
+class MessageSchema(Schema):
+    message = fields.Str()