Avoid this professor at all cost. Seriously. Nothing against Professor Scavia personally at all. It's just that he's not a good professor and can't teach mathematical concepts to students properly and clearly. Lectures were mundane and fast—you will see a lot of Professor Scavia's back as he scrawls numbers and greek letters on the white board. He doesn't record lectures at all, which is a huge red flag in my opinion. He uploads very, very messy lecture notes that don't even entirely correlate with what was covered. There was practically no way for struggling students to review or self-learn (if you happen to miss a lecture) effectively. The other professor who taught Math 31B during the same term had ALL lecture recordings AND notes that are very clear and structured (like very, very) uploaded to his students. I ended up using that professor's notes to study instead because Professor Scavia does not provide you with any study materials besides the textbook. No reason to pick Professor Scavia over other available professors.

Even though I received a good grade in this class, I would not say this class or professor was easy. The homework was manageable and not too much; however, the grader was quite harsh, so you definitely needed to double check your work if you wanted full points.
Although the homework wasn’t too much, unless you are naturally gifted at math, studying will take up a lot of your time if you want to get a good grade. Scavia goes quite fast, shows a lot of theory, does not necessarily show his steps in between unless asked, which makes new concepts confusing, and even told us the wrong equation or practice problem in lectures, further adding to the class’s general confusion. His office hours did not help as much either as his explanations made me walk out of the office hours more confused than I started.
One plus about him though is his flexibility. His exams are quite difficult because, even though he pulls the root of the problem from homework and lecture problems, he always adds an extra layer to them to make them more difficult and, in some cases, confusing. However, though he initially stated in his syllabus he would only do one curve at the end, he curved each midterm and final in response to the class’s grade distribution and average, so that helped a lot and, in my opinion, evened out some of the difficulty.
Overall, if there is another professor that is easier, I would highly recommend going with the other professor. While Scavia’s class is doable if you put hours into studying and practicing all of the textbook’s end of chapter practice problems, he is a difficult professor to learn from. I came into this class having only taken Calc AB and relied a lot on YouTube videos to explain new concepts and the textbook problems to get practice. Beware, even if you have taken Calc BC, this can still be a very difficult class.

when i took this class, scavia had scaled up the midterm grades by like 20% and the final by 10% which was reassuring cuz i did horribly in the midterms but aced the final and ended up with an a. scavia never recorded his 8am lectures which was fair but also meant that there was a lot of self studying to do.

exams are hard but he scaled a lot

This was one of the most enriching classes I took this quarter. Professor Scavia is extremely systematic, organized and helpful. One interesting thing to note is that he grades his midterms and finals at breakneck pace; never have I had a professor who graded tests as fast as him.
I found his grading to be fair and reflective of the difficulty of the problems that we went over in class. He ended up scaling up the midterms and finals to reflect the performance of the class. His homework problems were selected from the textbook and were well chosen to touch upon all the concepts that we had covered in class.
I had covered approximately the first half of this course in high school, but the second half was completely new to me. So, speaking from experience with having and not having prior knowledge, I can say that this class was challenging due to its pace. But the professor's extensive office hours, resources and additional help provided during the TA & grad student strike was integral to my success in this class.

I would highly recommend this Professor for Math 31B due to his systematic approach, subtle humor and accommodating nature and I look forward to taking more of his classes myself in the upcoming quarters!