Haoren Xiong is a great professor, while his lectures may be a bit dry, it's more so the content rather than his lecture style. His lecture slides are incredibly detailed, comprehensive, and useful when doing homework. In addition, he spent his virtual office hours helping students with homework problems and basically walked us through the problems step by step. While the final was a step above in difficulty compared to the midterms, he also gave us an overview ahead of time of what the format would be and instructed us on specific topics to focus on when studying. His lack of experience can cause some hiccups when it comes to his overall administration of the class, but he does his best to be as accessible and friendly as possible.

The professor is kind of just there. His lectures are not very helpful. Organic chemistry tutor and other online resources do a far better job at teaching the concepts. I'm sure Professor Xiong is brilliant, but it begs the question, why we are paying to learn from a sub-par instructor when we have free content online that covers the whole course? The professor is not terrible, but not good. Midterms were not bad, but he decided to screw people on the final. He chose more difficult problems that we didn't have as much practice with, and included a practice final that was definitely easier. I'm almost certain that he said that the practice final was going to be harder, and that if we did well on that, we would be set for the final. It was the opposite. There is no value in taking this class with this professor. It seemed like he was just clocking in.

Professor Xiong focuses so much on proofs that he doesn't do application problems which was difficult when it came to homework and exams. He's a super nice guy and new professor so he is pretty accommodating, but the reason I did well in the class is probably more credited to taking Calc BC in high school (it's literally the same class). TA's are also super helpful.

haoren was traumatizing. period. He picks THE HARDEST QUESTIONS from the textbook for each homework and his tests were tough af.

I felt like his teaching style was very fast and he did not thoroughly go through each aspect of the course. His way of teaching a topic was also much more complicated than the actual topic was, which made it confusing to understand the topic. His midterms reflected the practice midterms pretty closely, which were slightly more difficult and complicated.

Chill funny guy. Massive advantage to the people who took AP Calc BC, but that's true for any 31B professor. From what I have heard, his class covers easier problems than other 31B professors and his midterm/final exam averages were much higher as well. Overall his teaching style was solid, going over the concept in the start of lecture and then doing a couple problems. Workload is very light, only like 5 or so problems a week, but if you're struggling with the content or didn't take Calc BC doing a few more would def help. His practice midterms helped tremendously for the midterms, and both were very fair. The final was difficult, but still fair. Overall solid, would take again, probably better than your other options.

I personally loved Haoren. For someone who doesn't like math, I learned a lot and was able to make sense of so much more than I thought. The lectures are good and understandable and the recordings are great too (if you dont wanna go to class). Plus, workload is great. He gives a few questions after every lecture and that accumulates to a weekly homework. And, he accommodates for mid term weeks so you have more time to finish the homework. The discussions are pretty helpful IF you decide to go. You solve a worksheet in each discussion (so twice a week) and they make up 5% of your grade. BUT discussion is also NOT COMPULSORY till the time you just submit the worksheet the same night at 11:59pm. I would 100% recommend taking him for this class and I am 100% looking forward to taking his 31b class next quarter too.

Having taken Calc BC in high school, most of the material was already covered so I felt as if I had a solid base understanding of the content covered in the class. However, I felt as if Haoren at times did make understanding the material more challenging than need be with his style of teaching. His lectures were very organized, with easy-to-read notes that were easy to follow, but his delivery often felt short as he often used textbook terminology to describe the concepts instead of truly making them easier to understand. Despite his shortcomings as a lecturer, I truly do believe that he wants his students to excel in the class as if you need help with any of the homework problems, he is more than happy to go through them during his office hours.

I thought that Haoren's midterms and final were reasonable and were of comparable difficulty to homework problems and the practice midterms. I received a 82% on the first midterm, a 91% on the second one, and a 90% on the final and ended up with an A, so all in all, as long as you fully understand the homework problems and attend office hours as need be, you'll be able to find success in this class.

Despite being a difficult class, Haoren was helpful and clearly wanted us to succeed. He gave us a few extra credit points on the final for filling out his instructor review survey, bumped final grades up a half letter grade (from B+ to A-, etc.), and held several additional office hours during exam weeks. Definitely go to office hours, as he answers questions about homework sets in detail. In lecture, Haoren wasn't always the most clear, and I would often leave more confused than had I just read the textbook (all of his lecture material comes from the textbook). However, it was his first quarter teaching, and he got progressively better throughout the quarter. As far as exams, they were relatively fair. I thought midterm 1 was the easiest, midterm 2 was the hardest, and the final was in between those two in difficulty. Overall, I recommend taking 31B with Haoren, especially compared to horror stories I've heard of other professors.

I can tell that the instructor tries to do a good job, but I feel like most lectures were just not worth attending. He often goes off on tangents that are irrelevant and difficult to understand (for example explaining proofs that are not needed in the actual exam or for understanding), invariably making class harder than it is supposed to be. I knew a lot of the first half of class beforehand but attending class just confused me even further; the second part, I had to self-study the entire thing. The professor is available outside class though, I would say.