The professor opens the books and assigns the first grade that comes to mind. All students get the same grade they got last year. Grade is determined by G-d. All theoretical physics is really mathematics. All theoretical chemistry is really physics.
All theoretical biology is really chemistry.
YOUR grade is an object in a class of its own. The history of all hitherto existing society is the history of class struggles. Check out our joke archives. Pictures and sound files are welcome, too. All jokes have been submitted by our users.