I took this class in the spring of 2021, it just won't let me pick that. Anyway, Polstra is really good at explaining things, even better on a 1 to 1 basis. He offers a ton of extra credit so even if you don't quite understand things you can pass with a decent grade. Attend all the lectures, go to study group, do the extra credit opportunites, and do homework early for points and you will be fine.