Tests were okay, final letter cutoffs ended up lowering for the whole class.

Xiong is a terribly unfair professor who does not teach well enough and has incredibly hard tests. In lecture he mostly goes over proofs and very basic examples. The material itself is already pretty difficult and Xiong makes it even harder. One of the very few good things about his lectures are that they are recorded and his notes are posted. The workload honestly isn't bad but they do not compare to the tests which are exponentially harder and often times contain material that was barely ever mentioned. The only thing that got me through this class was my TA. DO NOT take this class with Xiong. Try to get another professor if you can.

Would not recommend taking this class with Xiong, especially if you do not have any background with Calc 2. His lectures are unengaging and he explained concepts in an overly complicated way. He is not helpful at all, so expect to self-study majority of the material. The workload was manageable as he assigns about 10 questions from the textbook about every other week, however these problems are all graded on accuracy and are worth 15% of your grade. The midterms were difficult given that we only had an hour to complete them, but I would say they were somewhat similar to the practice tests he gave us. The final was just absurd and the questions did not reflect anything we had done in the class. He curved the class, but this class was one of the worst classes I've taken at UCLA. If you want to succeed, attend TA Karthik's sections and watch Organic Chemistry Tutor's videos.

As someone who has usually enjoyed math before taking 31b with Xiong, I never wanna experience an environment like this ever again. The practice midterms and finals were completely irrelevant to the actual exams themselves. Lectures became a joke as it was almost impossible to understand a monotonic voice and heavy accent. The concepts themselves being taught in class were not understandable and complete different to the homework assigned. If you want a.real math professor for 31b just stick with ochem tutor and khan academy. Only reason I passed fr was cause of these goats. On all of westwood and odh don’t take this class with xiong.

This class may have been the most dreadful experience I have had at UCLA so far. As a person who usually understands and loves math, this course completely changed my feelings. His lectures are super boring, very unengaging, and you walk out not knowing a single thing that was said. His homework problems are related to the content taught in lecture (at least what I could understand) and it would be around less than 10 questions due every week. He has 2 midterms and 1 final (all in-person) and they are extremely complicated and questions that deviated a lot from the practices exams and homework's. EXAMS ARE VERY DIFFICULT AND YOU WILL NOT FEEL PREPARED FOR THEM AT ALL. Organic Chem Tutor on YouTube was what saved my grade, you basically have to teach the course yourself. The class average for the final was 64%... . I would not recommend taking this professor at all.