As a professor, she was pretty good. Even though she did not post a practice midterm or final, they were both pretty easy to do if you read through her notes. She was very open to helping during her office hours, but the homeworks were significantly harder than any material covered in lecture. I got a 90 on both the midterm and final and a 100 on the project but ended with an A- because the homeworks tanked my grade. The TA was not that helpful during discussion.

1. No practice exams, may easily bomb if you take it easy
2. Need careful review after class, as TAs do little help
3. Requires strong self-study ability to do well in the class (this class is not as easy as it supposed to be)

31B NOT Math 42 because whoever runs bruinwalk seems to have graduated long ago and no longer updates stuff.
Let me preface this by saying that pretty much everyone I spoke to hated this class.
That being said, I didn't hate it. I thought that the p sets were engaging and I actually enjoyed solving the problems (which was nice for a change). Lectures were interesting and substantive. The TAs were very helpful and it was very interactive. Unfortunately, most of the kids taking this class are bus econ or bio majors, and I can understand how it would be very hard for them. Also, maybe I feel more positive solely because I did well.

Unfortunately, Dr. Johnson has a bad case of a pretty nasally voice, which doesn't speak much about her character, but it did make it kind of hard to listen. She was also very blunt, which was off putting.
This was definitely a hard and unclear class, but interesting, so take it at your own discretion.

I’m sorry for whoever has to take this class. Pro tip, wear protection before you let this class fuck you up.

MATH 31B REVIEW!
(not on Bruinwalk but this class was so bad that I felt like I had to review, didn't take math 42).

I would try to find nice things to say about a professor even when I detest their class but Johnson's rude and condescending nature makes that difficult.
- Lectures are pointless (literally)
- Homeworks are some of the longest I've ever had at UCLA (over 10 hours/week, pretty much pointless time loss)
- Her voice is very difficult to listen to for 50 minutes (that might sound like an insult, but it's not, it's genuinely something you should take into account before taking this class, her voice hurts)
- She's not very willing to give help if you approach her, not that she's very approachable in the first place.
- Midterm scores were EXTREMELY low and most were panicking coming out of the final (she seemed to think that her class just sucked since she obviously can't be given ANY responsibility for her students not being taught well)

Her class is basically Professor Arant's class copy and pasted, so you're better off taking his class. The one saving grace about this class is that the notes are very nice, which makes self-teaching the material easier, but even then they're often posted too late to be useful on the homework and sometimes even after the midterm that they were supposed to be on.

Other notes: discussion attendance is mandatory, tests were difficult this.