One of the major benefits of being in a fraternity in my university was that the fraternities and sororities all had every homework and test most of the teachers at the school had ever released. I tests on the hardest math teacher in the school going back 36 years. I got asked a question on his final that he asked on his first and didn't ask in-between.

If he had spent more time teaching instead of coming up with insanely hard test questions we wouldn't have had that huge of a back file on him.

We used them for study sessions.

I can only imagine they are all online now.