Li was a good professor; he seemed to be concerned with our success and was open to our feedback as a relatively new professor. Lectures and discussion didn't require attendance. There were 2 midterms, a final, and 3 quizzes (in discussion section). Discussion sections usually just involved practice problems. The quizzes were pretty easy (I had a good TA who helped us prepare for every quiz) and the exams were tough, but I think if you study a lot you can do well (I'd recommend doing just a lot of practice problems). For all of the exams, Li gave us a few formulas, but you weren't allowed to have a cheat sheet, so memorizing all of the formulas and theorems is tough. Lectures weren't posted anywhere, but you could get that week's notes from him every Friday after class.