but grades are not.
one time i inquired of a university, and indeed the information is in the public domain, but getting to it is another matter:
they would give me the raw data on a computer tape and written in a social sciences software language!
so, you can get it, if you want it, and can interpret it.
I understand that individual grades cannot be public, but course averages ought to be. Evaluations of professors by students are public.