Professor Jukka is by far the best professor I have ever had within the two years of college so far. Before enrolling in his class, a lot of my peers have offered very positive feedback about him and his reviews on Bruinwalk was also very assuring. However, it was my experience in this class that I realized how amazing of a Professor he is and how helpful of a resource he becomes for us students.
Beginning of the summer session A, I met with him and discussed about dropping out due to the difficulty of the class; however, he reassured me and offered to take time out of his day to meet with me for a tutoring session to help make sure I understood the class materials. Not only did he went beyond his ways to help me, but he was very communicative and held many, many review sessions and office hours to answer our questions and make sure we were fully prepared for the exams.
Additionally, Professor Jukka is great at teaching the course materials as he's very clear and goes at a good pace for everyone to understand. Unlike some professors I've taken, he's willing to make sure that no students fall behind and that they can be comfortable to ask any questions.
I am truly thankful that I got to enroll in one of Professor Jukka's class because it was very eye-opening and I am very, very appreciative of his unwavering support to make sure his students succeed in his class. Without him, I would have most likely dropped out of Math 115A and probably struggled worse with another professor so I am truly grateful for Professor Jukka. He is an amazing professor and individual and I hope to be able to take more upper div classes with him in the future and I hope many students can experience the wonderful learning experience that I got with Professor Jukka.
I know he can't see this but I want to thank him very much and that words can't describe how grateful I am. The UCLA Math department is very lucky to have a professor like him and I wish him the best of luck!

OMG where do I begin?!?! Jukka will be the best math teacher, if not the best teacher you've ever had. Words cannot explain how terrified I was for Math 31A and he completely eased my worries within the first week. The COUNTLESS review sessions for the Midterm and Final also show how much he wants us to succeed in the class. He told us he sleeps 3-4 hours a day and it's literally because he works so hard for us :(. I will say, this class is a LOT of homework (up to 80 hour-long problems in a week), but it's all extremely helpful in understanding the material. Be prepared to dedicate most of your life to this class when you take it, but I wouldn't have had it any other way! If you fail the class initially (calc is sooo tough), Jukka will give you the opportunity to take an oral test with him through Zoom (basically a giveaway). He's the sweetest and he deserves the WORLDDDD!!!!! I also want to say that this was my first calc class and my math skills are absolutely horrifying. So if I can do it, you can too! Take advantage of office hours and tutoring (my PLF was a miracle)! and you'll do great :)!!!!

Jukka is the -best professor. Take him and you don't have to worry about one single thing.

Take 115A with Jukka. He has an awesome personality, clear lectures, and straightforward tests with LOTS of officer hours and review sessions. I got a C in 33a and didn't remember much about linear algebra but that didn't matter. Jukka starts fresh and makes it alot less intimidating. Attendance was mandatory but I didn't even mind going to every one. The small classroom size also completely changes the dynamic for the better.

If you need to take this class please take it with Jukka. He is by far one of the best profs I've had at UCLA and he is someone who truly cares about his students and wants them to succeed. He's very entertaining and kind; I was having a mental health crisis in the beginning of the quarter and he was very gracious with extending my deadlines. He also offerred extra credit for our midterms because of our class performance, and allowed us to drop one midterm if needed. The grading scale was either 1. midterm 1, midterm 2, final, or 2. midterm, HW, final. So make sure to do all of your homework because you might need to drop one midterm. He put in the extra work and more to make sure we were prepared for the exams and he made me enjoy math again. There were in class clickers, weekly homework, weekly in discussion quizzes, 2 midterms, and 1 final.

If Jukka needed a kidney, I would sacrifice mine for him. If you took calc AB in high school this class should be doable. The homework is an absolute pain in the ass. He gives 30-50 homework problems a week and although they are graded on completion, I've gotten points off because I bs the answers a little to much. The syllabus says "a decent attempt needs to be made on the homework for full points" Grading scheme is 35% final, best 2 of 3, 20% midterm1/ 20% midterm2/ 20% homework, 5% participation and 20% discussion quizzes (lowest 2 are dropped), so you can still get 100% in the class if you didn't do any homework or if you got 0% on a midterm. The midterms are very fair and super similar to the practice midterm he gives, so its in your best interest to do them. He gives you all the materials you need to do well on the midterm and final (list of homework questions) but its literally so much I didn't bother looking at them and just focused on the practice midterm instead. Weekly quizzes should be free points because you have 72 hours to think about your answers if you have your discussion on Tuesday since the answers aren't due until Thursday, so make sure you have your discussion on Tuesday. As a lecturer, Jukka is not the best since he is naturally good at math (his undergrad is from Princeton and Masters is from Cambridge) and has a philosophy background. He explains things in a very theoretical way which is not the most useful for basic calc. You're going to have to watch organic chemistry tutor to brush up on some topics even if you took it in high school. Also he gave us a chance to get back full points on our lowest scoring problem on midterm1, but only because the average was low (68%). Jukka won't fail you, but the class is not a free A. Just make sure you study well in advance for the midterm and final and go to the review sessions.

Hes great, the other reviews go in depth so I dont have much to say except take his classes :).

TAKE HIM!!! Jukka is by far one of the best professors at UCLA. He genuinely cares for his students and offered so much material that helped. I had never had any previous calculus experience, and while sometimes the lectures confused me, him posting the slides and assigning relevant problems in the worksheet and homework really helped me get a good understanding. Also he is SO HELPFUL with getting your grade up, the homework replaced one of our midterm scores and he gave us extra credit on a midterm that he had to grade himself despite him already having this curve in place. There were so many office hours and he would always be willing to work through problems with students. I cannot stress enough how amazing he is, some may complain about the workload, but since the homework replaces the midterm, I believe doing all those problems is extremely well worth it. Overall, totally take him if you can!!!

Keranen is an amazing professor. He cares about his students' learning and makes his lectures interesting for them. His tests are fair. His grading and format for assignments is fair. Very good professor and makes 30B easy to learn.

Best professor at UCLA!