Koffi is definitely the best professor I have ever met during my first quarter at ucla and also the first quarter during pandemic times.He is a kind person and is tolerant of late submission but workload is a little bit heavy because he assigns not a lot but many question which could be finished by majorities and very helpful.I also enrolled in his other classes and the workload was not as heavy as it was probably because 2020 fall quarter was the first quarter here at UCLA for him so he needed sometime to adjust so you guys can forget what I said about the workload and do not need to be worried.There will be nothing wrong for you to go with koffi.

Find someone else if you can. The workload is really high. My main problem with it is that some quizzes and test questions were not really very related to the class material. If you are a math genius, go for it no problem. The TAs were great but there were too few of them. The (live) lectures were quite disorganized, and the professor’s own time management didn’t really help either. If you take this class you may feel it is super easy by first midterm and just down right train wreck as yo approach the final. Hopefully he will reorganize the class to make it more doable for non-math nerds,

Reading the textbook is enough preparation for lectures. There is one set of homework given each week, except the last week where 3 homework sets were released. These sets are long and time-consuming so make sure to block off enough time to do them all. The professor is still adjusting since he is quite new.

To put it plainly, if you take him you'll have a homework each week (no exception) with on average 25 exercises but it can go as much as 40, which takes on average 7 to 15 hours. It's a heavy workload, especially when you have him in 2 classes (would not recommend at all, I had 60 to 80 exercises a week just with these 2 classes, it was a nightmare).
He doesn't drop any grade (not flexible at all on that), but you can give back all homework until the last day of the last week.
For the test, it was covid so we had 24 hours, it was honestly not that bad compared to the homework and the course. Everything was doable, but clearly not in 50 minutes as he said, more in 5 to 6 hours. But doable, not impossible.