20 13 The preparatory class of Dalian University of Technology enrolls about 70 students. I don't know where the subject is, and the number of students enrolled varies from province to province. The preparatory course of Dalian University of Technology is still very good. The preparatory course is basically managed in high school for one year, with morning exercises and self-study at night. Compared with other schools, the preparatory course is relatively strict, and you choose your major when volunteering. But if you are not satisfied with the preparatory course, you can change your major as long as you study hard for one year. I hope I can help you.