The grading scheme for this class was on a straight scale based on the number of points from several categories:
Each midterm is 100 points
Final is 200 points
Top 8 of 10 quizzes are scaled to 100 points
Group projects during discussion section were 50 points.
For a total of 550 points.

The grade scale was relatively generous with 90% being the cutoff for an A, 84% for an A-, 81% for a B+, 77.5% for a B, and 74% for a B-.

This class is difficult, as indicated by the grade scaling, but not impossible to do well in.
The first midterm tested on IR Spec, H-NMR, C-NMR, and Mass Spec. This material was the most difficult for me as there were many tiny details that you had to pay attention to when doing the problems. It is very easy to miss something and lose points because of that.
The second midterm tested mainly on Synthesis problems, with one spectroscopy problem similar to the first midterm. This class is all reactions after the first midterm. For me, Anki flashcards were key to memorizing all of them and doing all the practice problems from the book was great prep for the second midterm and the final.
The final was also mostly synthesis questions, but had two spectroscopy problems.
The timing for the tests was actually decent. I usually 'finished' about 30 minutes before I had to upload to gradescope, so I spent the next 25 minutes combing through my answers and checking for mistakes.
Practice tests were posted before each midterm and final. They were all accurate in difficulty and helpful in gauging how prepared you are for the actual one.
During the (open book/note) tests, I wrote down as much material as possible and had everything in front of me, although I don't think that will be possible in the future once classes are back in person.

The lectures for the class were all pre-recorded and posted on CCLE. The actual lecture time served as office hours. The lectures were kind of dry, but decent enough. Dr. Ow gives you the material and constantly reminds you that the key to doing well is doing practice problems. Keeping up with the material is all on you, so don't slack on watching the lectures. Leave time in the week to do the book problems as well. I highly recommend getting the solutions manual to check your answers. I couldn't find it online, but its relatively cheap if you rent from Chegg or some other service (less than $15).

During discussion sections, we were given 'reaction roadmaps' that showed how to go from molecule to molecule. The group projects were filling in the reagents, reactants, and products in these roadmaps with classmates in your discussion section. These group projects are basically free points if you go to your TA's office hours and make sure everything is correct. The roadmaps are also very useful during tests.

Weekly non-timed quizzes were posted on CCLE, which covered the lecture material for that week. They were relatively easy, but worth checking your answers so you don't miss out on points. You only had one session to do the quiz as well, no stopping in the middle and starting it again at a later time.

The average for both midterms was 64%. I got a 69% on midterm 1 and 85% on midterm 2. I don't know the average for the final, but I it was probably similar to the midterms. I got a 94% on the final and got an A in the class. I assume there was a small upward curve applied to the class as I don't think that I made the cutoff for an A based purely on points.

30B is one of the most difficult chem classes you'll probably have to take, but even for someone like me whos weakness is chem, and scored low on the two exams, his grade thresholds makes it virtually impossible to fail.

He doesn't curve or offer extra credit, but is a very straightforward lecturer. He explains his thought process with every step and his lectures are pretty helpful to gain a decent understanding, but 30B requires a lot of critical thinking and an "intuition" for a lot of it that you'll have to develop on your own with soooo much practice. He doesn't overcomplicate concepts during lecture which makes it very easy to digest in-class, but you have to master these concepts to be able to apply them in an much more advanced way during the exam. Lectures are recorded, and you pretty don't need to actually go but I learned better in person. He throws in some humor here and there which is nice to break up the rigor of the class.

The book problems are not required and are a hit or miss, they were helpful in the beginning but too easy compared to the actual exams near the end of the quarter. For alcohols and mechanisms I'd recommend making a list of each "toolbelt" item he gives you and what it does. Refer back to this while you practice till it becomes second nature. He says there's no memorization but you definitely need to memorize these "tools"

The quizzes are online over the weekend and not too bad, two are dropped. The exams however are rough. The way he asks questions on exams is really weird and he will throw in the random thing from lecture you probably didn't think was important. It's also a LOT of work for a 50 minute exam so make sure you don't freeze up during it.

Having no assignments other than a small quiz means lots of time to study for this class on your own which is doable! I know a lot of people who succeeded in this class despite the tough exams

Great professor, arguably one of the best chem professors I've had. Make sure to do the groupwork, additional practice problems he recommends, and follow his recommended timeline and tips for studying. He has office hours, but because of my TA's helpfulness during discussion, it wasn't needed. He also provides practice exams that are extremely similar to the tests. Overall the class is ultimately difficult because of the subject matter but professor Ow does an amazing job at breaking it down he even prints out copies of his slides for students to annotate along with him during lecture.

This professor kinda sucks at lecturing ngl. If you want to actually gain a good understanding of organic chemistry, look elsewhere. He gets visibly annoyed every time you ask a question (even if it's a simple yes/no), and on the off chance that he does try provide clarification or deeper insight into the content, it's never satisfying or clear. He doesn't have passion for the material he teaches and often acts like he doesn't want to be there. Sometimes he is a little funny and entertaining but I never felt like this was someone who cared about chemistry or student learning to a significant degree.

One thing I will give him credit on is that he gives us printed lecture notes that are pretty decent (they are the same as the ones he uses for the 14 series though, which is slightly concerning). The homework is also very manageable and he does give us some practice materials. However, these practice materials tend to be easier than what's actually on the test. Even so, the exams are still pretty fair. Overall, I liked CHEM 30B as a class, but this professor wasn't really anything special.

Grade Breakdown:
Midterms: 35%
Quizzes(Top 4 out of 6): 20%
Discussion: 15%
Canvas Discussion: 5%
Final: 25%

A pretty fair grader, a decent lecturer, and tests are straight forward. Just go to class, try to memorize the reactions/figure out common patterns for mechanisms and do a lot of practice problems and the class shouldn't be too hard. The spectroscopy portion of the class is pretty terrible, but reaction-wise, it shouldn't be too difficult.