Spring 2020 - Allen is the BEST math professor I've had at UCLA. His lectures are super straight forward once you get used to the material, and those combined with the homework is everything you need to do well on his tests. His homework is super helpful but can be a bit tricky doing the problems for the first time. People did super well on his tests this quarter (he also gave us a very extended amount of time) with the average being in the high A range. That being said, I feel like even during a regular quarter his tests would be super reasonable and test you exactly on what he has taught you. Allen is so dedicated and offers a bunch of office hours, and will go so far as to schedule an extra OH on the weekend if he gets a lot of questions. He also responds to your questions super quickly via email or piazza. I would 100% retake this class with him, it has been my favorite math class. Also shout out to Jeremy Brightbill, the best TA with the most life-saving review sessions who will hold office hours until every person has asked every single one of their questions, even if it means logging out of zoom at 11pm.
Winter 2020 - Honestly, best online notes available I've had yet for a math course. You can take these notes and understand the material in a rather short amount of time because of how well-written they are. Homeworks are difficult, but going into tests after them makes the tests feel easy by comparison. He also has a VERY generous grading scheme for individual tests. Overall, this class was a good experience and very welcomed given my experience with past math professors.
Fall 2018 - I love professor Gehret. His lectures are super organized and clear. I would definitely recommend taking 115A with Gehret if this is your first proof class. His homework can be sometimes challenging but it covers every topic he talked in class. And my TA Jaehoon Lee is so far the best math TA I've had. They both put a lot of efforts into teaching and they care about how well their students are doing in the class. Most people did not like 115A that much, but Professor Gehret made it great. His tests are fair too.
Summer 2020 - Take a class with Allen Gehret. He looks out for his students and always willing to help. He had like 3-4 office hours throughout the week which was awesome. His lectures were a bit slow in my opinion which I would rather have than too fast. He was very thorough with his explanations and made the material easy to understand. His homework is not too difficult and was the perfect blend of math+programming. He had about 15 homework problems but as long as you did 7 correctly you received full credit. He had quizzes which were extremely easy and median for almost every quiz was a 100%. Plus, he drops a quiz and homework which was a plus. The midterm and finals were easier than the homework and had about a 92% average. He grades on a standard [93,100]: A, [90, 93) A-, [87,90) B+, etc. scale. The TA was alright. His lectures were okay but still good and his worksheets were as hard as the homework if not harder. Long story short, I would definitely take another class with Allen