Three or four classes. According to relevant information, a counselor has 3 to 4 classes. There are thirty or forty students in one class and one counselor in Shanghai University. It is very easy to take 100 students. College students are very self-disciplined, they are all adults, and they don't need to be urged every day like children. And if every class in the university has a class committee, which can help counselors and teachers do a lot of things, you don't have to bother.