C# object oriented windowsform

A windowsform app, made in c# with object oriented programming in mind.

Assignment:
A school has an admin program(the windowsform app). You should be able to create new courses, display the current courses, and add students aswell as teachers to these courses. You should be able to create new students and teachers.
These students and teachers should then, like i mentioned above , be able to be added to different courses, and these courses should have different names and IDs. And in these courses there should be a function to be able to add assignments. Therefore you should be able to create new assignments aswell, and then add them to the course of your choosing.
The students should then be able to be graded in these assignments, you should be able to get a different grade depending on the different assignments.

Needed: All classes need to implement interfaces.
Dont before 31/12