If you liked calculus, biology, and a little bit of coding, this class will be a breeze. There is a learning curve in the first couple of weeks and the topics feel very abstract, but trust me when I say that everything will eventually click. Please please please attend labs, because the coding assignments are graded based on accuracy (due at the beginning of the next lab). The TAs are super helpful with going over both the lecture and coding material.
Lecture is honestly not as bad as people make it out to be. There are clicker questions, but they're graded based on participation. If you sit near the front pay attention, Prof Shevtsov is engaging enough and really isn't that hard to understand.
The homework was honestly long and stress-inducing, but they were helpful in clarifying stuff that Shevtsov may have been unclear with during the lecture. (And again, if you're confused, ask your TA for help!) Luckily, they were graded based on completion.
For the midterm, if you are able to do the practice tests Prof Shevtsov gives out, you will be completely fine. On the other hand, the final felt slightly different from the practice exams. The general consensus was that it was harder than the practice, but that might just be because I sucked at them. Although I never attended a single Problem Solving Session, I have heard they were very helpful and the TAs and LAs gave out questions similar to those on these exams.

This class definitely had a bit of a learning curve because it uses calculus principles in an extremely unorthodox way. If you took calc in high school, you should be OK for the first half of the semester, however after the midterm they started introducing new material that could be a little bit confusing. The coding labs weren't too bad and the lab practical was fair. I would highly recommend attending the problem solving sessions, since they cleared up a lot of my initial confusion. As for professor Shetsov, she was not nearly as bad as the other reviews made her out to be and she is definitely very knowledgeable on the subject.

Literally, avoid Shevstov at all costs. I'm serious, the 30A/B series is a freaking scam from our school. It's a fake math series and you're going to be better off taking the 3 or 31 series. This whole series was created to spite the math department basically and it still isn't accepted for some graduate schools; however, the 3 and 31 series are.
But, really from what I've heard recently, they've made the 30 series harder since they actually test on coding now. Shevstov herself is a pretty bad lecturer and 99% of the time you will not be able to understand her.

This class is manageable. Class structure is lecture on Thursday and Q&A on Tuesday. Jane is a really nice person. She’s interested in interacting with her students and she was very considerate of her students.

The lectures are somewhat slow. Also, every Thursday she assigns a horrific amount of videos for you to watch. Learning from about five to eight 15-40 minute videos every week is not ideal, but this class could be much worse.

Homework and notes are assigned everyday Thursday and due the following Thursday. They’re all graded on completion, so don’t worry. There’s a weekly quiz, but it’s not that bad because you get three tries and unlimited time. Labs are somewhat difficult, but I had the best TA ever (John), so I got the help I needed.

The midterm and final weren’t bad because it was open note for 24 hours. The tests are very similar to LS 30A tests. However, I wouldn’t have been able to get an A on the tests if they weren’t open note, so I’m glad I took this class online. We also had a group project instead of a second midterm. Project was fine and you can ask the TA’s for help.

If you take 30A and 30B-do it with Dr. Jane! She is a really helpful professor. During covid, she made herself available for extra help and office hours more than any other professor. She genuinely wants you to learn and understand the material. She gave us a PDF of the textbook -which she wrote herself- and it's a useful addition to her lectures. The homework felt like busywork sometimes, but come exam time, I was happy to have had all the extra practice. I disliked the pre-class videos each week because they were so long, but otherwise her lectures were worthwhile. She also picks stellar TA's who are very knowledgeable about writing code.

Professor Shevtsov is a great professor. I took this class when quarantine started, so there was a bit of an adjustment period for online classes, and Prof Shevtsov was very understanding and accommodating. She's really helpful during lecture, answers questions clearly, and is thorough in her explanations. Lectures can be slow sometimes, but that was because she went through each problem step by step to make sure everyone understood the process and how to do it. She's also one of the people who wrote the textbook, and it is clear that she is passionate about what she teaches!
Compared to 30A, 30B is pretty similar in terms of class logistics but more difficult in content overall. If you did well in 30A, then 30B shouldn't be too bad.

Do not take it with her!

Lab: If you don't know how to code, this class is going to be so hard for you just as it was for me. I came into this class thinking it was just going to be another calculus class and I was excited because I love calculus, but it wasn't. There was a coding lab, which was frustrating to say the least and often times did not make much sense. At the end of each quarter, there is a lab practical, but we did not have that this quarter because of the TA strike.
Lectures: She had slides and would explain things minimally, but I figured out soon enough that if it weren't for the TA's writing notes down as she talked, I would not understand. That was literally the only way that I would semi understand the content. Also iClicker is mandatory and it is also not free.
Homework: The homework was so exaggerated. I had other friends in the same class with a different professor and they had about 8-12 questions of homework a week and on the opposite side of the spectrum, she assigned close to 25 questions at a time, which I felt was not that helpful.
Exams: The exams were reasonable and they were doable because of the problem solving sessions and office hours.

Jane was a very sweet professor and obviously passionate about the subject, but it was often extremely difficult to understand her. This course is pretty difficult, so it makes it worse when you cannot understand the professor. I always left lectures feeling like I learned absolutely nothing. I found out that her exams were supposedly easier compared to other professors. She was extremely accommodating during the TA strike. The course itself is one of the worst courses I have ever taken, but that is not really her fault. My final grade was a B, which for someone who was completely lost throughout the quarter, I would take as a win.

Honestly, don't take this class. Take the Math 31 series. The material is seemingly useless and there's an unnecessary amount of coding and homework. Jane is super nice, but she's hard to understand and the lectures are just the textbook (which is not a good textbook at all). Thankfully, we got excused grades because of the TA strike. The midterm was fair, but the final was super hard.