I took AP Calc AB in high school so this course should have been a review yet I struggled like crazy. Fan is a good guy but his lectures are basically just him reading from his notes, which he posted on CCLE anyway. If you were to just study his notes and never go to lecture, you would have been golden. I think his exams were significantly harder than those for other 31A classes during this quarter. He always did a "challenge problem" for the last question on exams and they absolutely destroyed my grade. He says it's only 5 points so it's not a bid deal but there were only 50 points on the exam so those 5 points are 10% of your grade. I think for the second midterm, the max score was 92% because NO ONE actually got full credit on the last problem. Those problems are always conceptual and they ask you to prove some statement usually. This is probably to expose us more to the structure of upper div math, but we're just a bunch of dumb first-years who don't understand anything yet so it was real rough. However, he really came through at the end and hit us with an EXTREMELY generous grading curve and I got a significantly higher final grade than my midterms and final scores. So basically, professor isn't the best lecturer but the class won't ruin your GPA either.