I took 31B with him 2020 winter. This guy made everything super clear and the exams are all fair. His accent doesn’t matter anymore after attending the third lecture and actually he would write down everything he said on the board. so no worry about that. Trust me you’ll definitely get good grade if you go to lectures and finish his homework.

I retook this class after failing 31A with a different professor my fall quarter, and I found Popa's test to be significantly easier than my old professors. He makes them pretty similar to his practice exams, so study those well! Otherwise, you have a reasonable amount of homework due weekly and it's all pretty manageable.

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I can honestly say Professor Popa is one of the best math professors that I've had at UCLA. He has a thick accent but is still easy to understand and has a great sense of humor. His midterms were pretty easy and the final was kind of hard but if you study in advance there's no reason you can't get an A in this class with a little elbow grease and hard work. If you are looking for an easy 31A professor look no further. He is the best in the business.

I took this course with Professor Popa in the Fall of 2015. The grade I received was an A. There is no extra credit in this class. Overall, I really enjoy math, so the course material is very interesting to me. However, Popa isn't a very good lecturer in my opinion. His thoughts are sometimes clouded, and he gets distracted very easily (e.g. if someone asks him an off-topic question, he may spend 5-10 min talking about it). He has a very heavy accent, which wasn't too hard to understand, though others stated they had trouble understanding him at times. He has messy hand-writing, which was difficult to read at times, if you were not following along the entire time. Don't get me wrong, Professor Popa is a very nice person, and he was very funny as well; but as a lecturer, I don't think he was the best. I recommend reading out of the textbook to do the learning. His tests weren't that bad, and if you are comfortable with the homework, you should do fine. About 3-4 questions for the midterms, with sub-parts. The final was rather difficult, and lengthy (i.e. I spent the entire 3 hour period), but still managed to get an A.

This dude has a heavy accent, however you get acclimated to it. He adds a nerdy humor in his lectures, which makes them about as engaging as you can get for Calculus. 8/10 would recommend.

Popa's accent takes a bit to get used to, but you will get used to it by the second week. He told us that he has arthritis, and that's why his handwriting isn't that great, and believe me, IT IS messy. So it's really important to hear what he's saying so you know what he meant to write. His class doesn't move that quickly, and the homework load is typical of math, but not too bad. He's pretty clear in class but he also doesn't elaborate on stuff amazingly well. However, if you go to office hours, he's really helpful one-on-one.

Popa is a good professor who clearly loves math. He goes through a lot of sample problems in lecture and his midterms and exam is fair. His teaching style is definitely geared towards those who have some prior background in calculus. Although I did not have as much of a calculus background as many people in the class, I managed to follow along for the most part.