I thought Prof Yang was very personable and nice, he always tried to make the lectures engaging and I liked his little anecdotes about game of thrones, his cats, etc. I also thought his tests were extremely fair, there were never any surprises and he gave us a drop test which was replaced by an average of the other two. the final was just 25 mcq, some pulled from the previous tests so if you go to lecture, take notes and pay attention, you will definitely be fine.