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.

If Haoren Xiong has a million haters, then I am one of them. If he has ten haters, then I am one of them. If he has only one hater then that is me. If Haoren Xiong has no haters, then that means I am no longer on earth. If the world loves Haoren Xiong, then I am against the world. His accent, monotone voice, and lack of explanation in much of his work make lectures terrible, at least they were recorded. 64% avg on the final, DO NOT take Haoren Xiong for 31B

This class should be an Eighth Amendment violation. This class is a Biz Econ major's nightmare. If you take this class after reading all of the negative reviews, do not say that you were not warned.

Xiong is to Math 31B what Ebert is to Math 32A. Xiong's exams deviate so much from our practice material that it is mind boggling. Even though he may have barely gone over it, he assesses squeeze theorem, triangle method (Fall 2024 Final), and induction. In my opinion, he is one of the worst lecturers I have had at UCLA. The only people that succeed in this class are those who have nothing better to do than study for Math 31B, and even then, they struggle. I cannot emphasize this enough: If you care about your GPA, stay away from this guy!

What idiot would take this guy twice??? Oh wait, I think I know the answer to that question.