No. I've never really been in a class where someone else had a deeper understanding of the material to cheat off of. Equal sometimes, sure, but equally likely to be wrong.

I did reach a point in math where I couldn't go further and took that as a sign. Math is math. If I can't do it in a test, I'd just be putting myself in a situation where I'm expected to do things I can't — most likely in the next class.