Don't take 181 with him! Professor Wang puts the least effort in teaching -- he used the slides of other professors with Chinese on them; he can't explain anything clearly; he doesn't reply to students' complains. You won't get any practice for the hard exams, however, you are expected to put a lot of effort to learn everything by yourself.

Professor Yuan-Fang Wang is the worst instructor I have ever had for anything ever. He is willing to intentionally punish the class via exam difficulty.

Take his class if you like a challenge in that you need to learn everything yourself as coming to his worthless lectures is as good as wasting time. Otherwise if you take his class you might as well be mentally challenged and my deepest condolences to you.

DO NOT take any classes taught by this professor. His lectures are full of math equations that he doesn't explain whatsoever, no one learn anything in lecture so only like 5 people show up out of 100 people. I can guarantee you will regret taking his classes.

Lectures are pointless to attend

Probably the worst engineering professor I have had at UCSB. He could literally teach PEMDAS and make it seem impossibly confusing. Gets frustrated that no one shows up to class, so rather than improving the lectures, he makes the tests intentionally punishing. TAs can't help because they don't get solutions to HW assignments. Avoid at all costs.