So here is my code.

features are inside this website:

1. authentication
2. assignment creation for role teacher and admin
3. Adding a user for role admin(admin can add teacher and student ID)
4. Assignment completing for role student
5. Assignment checking for role teacher(a teacher who assigned assignment can only check that assignment)
6. mark sheet generation
7. The teacher can give numbers or marks
8. Images and PDF can be uploaded as question or answer by teacher and student
9. Class and section-wise assignment assigning.
10. Admin can delete users or edit profile
11. user can edit his own profile
12. class wise filters
13. much more