Do you have to know a lot of stuff from Accounting 1 to do good in Accounting 2?

I took accounting 1 but I don't remember anything

Great interplay between current events, your username, and topic title. Would recommend to a friend.

Define "Accounting I" and "Accounting 2". Do you mean Financial Accounting and Managerial Accounting? A lot of schools tend to structure these sorts of courses differently.

Yes. You do. In fact, if you don't know have a clear understanding of Cauchy's integral theorem, you are doomed.