His homework is difficult, but doable. They are all from the textbook's exercise or modified versions. The difficulty is not from the professor but quantum mechanics itself. There are unexpected questions in exam. You have to use your concepts creatively to solve it. You have to be good at math otherwise this course is a disaster.

LOTS OF HOMEWORK and he always finished teaching the topics on the day the assignment is due. Theres no relation between hw, lecture, practice final, and final. Accessable outside the class, but he's missing in last two weeks. You cannot avoid Professor Jin if you want to finishe 115 series, so good luck.

You wont be able to write your homework until the day he finished his second lecture everyweek, leaving only 4-5 hours to do the homework. There's no relation between lecture, assignment, and finals. Prepare to be exhausted after you take the course.

Prof Jin's course is of standard difficulty, or at least in terms of one of the most difficult and fast-pace courses here. His lecture notes are always fantastic and help you learn quantum. He might give difficult finals but he'll do curves. Sometimes his wording (in HW, lecture) is confusing, but you'll find it inspiring after getting his meaning.