any reason for the high drop out rate?
I can't really put an exact reason as to why but the general consensus is that Dr He has kinda become worse over time. He uses the same notes every year and while it is challenging, he doesn't really help with VCE since the people who go there are normally really good to begin with, and you'd basically never see some of the problems Dr He teaches on the Methods Exams.
The general declining quality of students as well as the fact that his classes are often at the worst times (Friday evening) in crowded classrooms makes it not worth it for many. A few years ago, all his classes were full and there was a waiting list, nowadays, its not uncommon to see unfilled seats in his classes.
But that isn't to say that Dr He isn't any good; he's still one of the few tutors that really extends your mathematical knowledge and his accent and common expressions are pretty hilarious