Handle modification to course structure and grading schema

[parth-07]

Is your feature request related to a problem? Please describe.
Course syllabus, structure and grading schema can change, thus application should take measures in advance to handle these scenarios. For this, application will need to know which grading schema is relevant to a particular user, for this we will need to know info regarding user graduation year or year in which user started the course.

Describe the solution you'd like
If we know user graduation year, then we can calculate which particular grading schema is relevant to a particular user, and work accordingly to the relevant grading schema. Thus, we need to save user's graduation year (or year in which user started the course) in the user's profile. Calculation of which grading schema is relevant is trivial and can be done either directly in the application or in the server.