Professor's second language is English, and it is sometimes hard to understand him because he lectures extremely quickly.
He is alright at understanding and answering questions, but sometimes his answers are not much more helpful than the original explanation. I found it helpful to read the textbook to review each section after listening to lecture.
Tests are pretty standard difficulty for math department, which is to say some of our averages were below 60% on some tests... but the class is curved :)

Das is a very nice man who is more or less lost in his own world. I feel like he's chill as a person, but he's an outright terrible teacher. He teaches so so slowly, and his homework and quiz system is very disorganized. He didn't teach like 90% of the things I needed to learn for my career in engineering, and what I did learn from him was word for word recited out of the textbook. The nice thing about his class is that his tests are for people who only go to his lectures, which means they are extremely easy. I recommend enrolling for his class but attending the lectures of a more highly ranked teacher. I did that and was able to learn the required material while breezing through the tests. His main redeeming factor is that he has like 3 outfits, and you get to see which one he wears the most. Right now, the purple pinstriped shirt is in the lead.

This class is definitely not an easy A. The professor is very nice and understanding, however, it is very hard to understand him. Regardless, that is not the main problem. The main problem is that there is no room for any mistakes when it comes to your grades. If you mess up one midterm, that is it. You cannot go back and fix you grade. The quizzes every week are very challenging and many people fail. The second midterm's average was a 60%. Professor Om said that he will make the final easy because of this. However, do not come in expecting to get an easy A in this class. It is very tough and the TAs grade very harshly.

Das teaches incredibly slowly which is why he doesn't have a step by step breakdown of the syllabus according to weeks in the quarter. I would really advise against taking his class: you don't cover enough, his lessons are disorganised, and he too easily gets sidetracked by students asking stupid questions. Honestly, the TA could've taught the material better. What you should definitely keep in mind is that he tells you pretty much exactly what will be on tests so actually study those. His exams were all stupid easy this quarter so if u don't study exactly what he tells you to, the curve will destroy you.

Das talks really fast, but somehow the pace of the class was way slow. We were behind by about 2 weeks going into the last few weeks of the quarter and he had to rush through the last few topics. The good thing is his midterms and final aren’t bad at all. He gives materials that really help you prepare for the midterm and finals and his tests are very easy to score average or above on if you use the study material he gives. If you’re a person who doesn’t go to lecture and just learns from the books and takes the tests this class is definitely for you. You will have to go to discussion but lecture you will not. If you are a person who needs a strong lecturer Das is not that. It’s a bit all over the place

ok so das is really nice but his lectures are very disorganized and without the book i dont think i would've understood or felt like i had a clear picture of what exactly we were doing. the tests were easy in that every single problem you have seen from homework, but you have to be careful with the proofs and actually prove things correctly haha because that's where you can lose a lot of points despite the rest of the test being super easy.

I came into this class expecting a pretty good grade (B or higher). The first midterm was relatively easy and I could've gotten a good grade but ended up with a 60% because I didn't check my answers, so that was a mistake on my part. For the second midterm, I scored 37% and my quiz average was 82%. The class mean for the two midterms were 68% and 61% and the final's mean was 76%. At this point, I thought I was gonna end up with a C- or D. I felt very hopeless because I thought I wasn't gonna get the grade I wanted. However, I decided to stick through it and work on the study guide he assigned (it's very helpful for the final) and got an 82% on it.

As for the overall class experience, Das was hard to understand at times because of the accent and would talk very fast, I had a pretty decent TA that helped go over the concepts that were covered in class. One piece of advice I would give is to read the textbook and practice the homework problems he assigns, you do need to have a " superficial understanding of the formulas" to do the proofs on the test. CHECK YOUR ANSWERS because it is VERY EASY to mess up. Out of all the quizzes, there was one only quiz that was really bad because many people didn't know the shortcut, but other than that the quizzes were easy because they were homework problems and the little mistakes got me. Also, the class is curved.

Workload is very easy as there is no mandatory homework. Midterm 1 is easy, Midterm 2 is tough, but the final is the easiest of all.

Taking 33A with Das was easy but also confusing. His lectures are slightly disorganized, and he's not amazing at explaining certain problems - he focuses a lot on proofs of theorems, and less on how to apply those theorems to the kinds of questions we'd see in the homework. In addition, our class was quite behind on the syllabus, and we rushed some pretty important concepts: we got to eigenvalues at the start of week 10 (2 or 3 weeks behind), which didn't give us much time to learn about some of the most important material for the class. In addition, we entirely skipped imaginary numbers (and eigenvalues) and SVD, which is not great if you need to apply the math in 33A to other classes. However, Das does try to make sure that students understand the material he goes over in class, though he's not always effective at it.

Das's tests are very easy if you do the homework: he mostly just takes problems from assigned homework questions, changes the numbers a bit (or not at all), and puts them straight on the midterms and finals. Doing the homework regularly is more than enough preparation for the tests (I think about half of our class was in the A/A+ range for one of our midterms), and he mostly tests you on basic fundamental ideas rather than nuances of those ideas or carrying out ridiculous computations. In a way, I really appreciate this format of testing, since it rewards you for understanding the material - however, we probably could've been tested a bit more rigorously.

Overall, I'm ambivalent with Das - taking the class is good for your GPA, and if you do the homework, you'll have a solid understanding of the core fundamentals, though you might miss out on more complex details (or fall behind and not cover topics at all)! If you do need the math you learn in this class for other classes, I'd recommend following through his lectures in the textbook - that helped me out in understanding the material.

Although Das does care about his students and sends emails frequently to ensure everyone understands expectations, the class itself was not a good experience. While the final was fairly straightforward and most people did fine grade wise, there was an unnecessary amount of work/confusion. I would not recommend taking him, but if you do, here's some things to know:
-This quarter, we fell very far behind, very quickly. We covered a bunch of key linear algebra topics very quickly in the last day or two of lecture before the final. As a result of poor pacing, I didn't walk out of that class really understanding what we were doing.
-Discussion sections do not have worksheets. Rather, the TA just lectures on some problems he/she seems to pick on their own.
-Both midterms did not represent the homework and were very proof heavy, but the proofs were simple if you figured it out. One could make it through both of them with flying colors without actually computing much.
-The final seemed more reasonable and balanced between computation/proofs, but was heavily weighted on those last couple of days of lecture.
-There was a very large amount of homework assigned in the class, and 90% was never tested on it felt like, but one had to do all of it just to make sure they were safe.
-Lectures were just very dry and dull in my opinion, though this is mostly due to an infamous guy in our class who asked an excessive amount of questions and took up all the time. When Das actually gets on a roll, there are some good moments.