Reviews of professor Yuanqi Wang

Rating: 5.0/5, difficulty: 3.0/5
Professor Wang has good lectures, and the notes are well done with pictures and examples, and all of them are posted online. The homework is challenging but reasonable, it took about 1-2 hours a week. He's always reachable by email (sometimes even past midnight) and is willing to help. He's also just a very funny and upbeat guy in general.

Rating: 4.0/5, difficulty: 2.0/5
Dr. Wang has taught this course nicely by having good lectures and assigning homework assignments that help students during midterm and final exams. Also, he has helped students' grades by providing extra credit points and dropping the lowest homework scores. Differential Geometry's topics are slightly confusing, but they are not too difficult.

Rating: 2.0/5, difficulty: 4.0/5
At the beginning of the semester his teaching was fine, but as the semester went on his teach depreciated. His exams are awful and way too long to finish in the allotted time. He is absolutely UNREACHABLE outside of class. I emailed him 4 times during the semester and was in the ER and had to miss class and he never responded.