You must take the exam. Line generation is a compulsory course for college students, and only a few majors do not take the exam. Although I am not very clear about the situation of Jiaotong University, I still feel that it needs to be repaired. In fact, you can ask on the bbs of Jiaotong University or the post bar of Jiaotong University. It is more useful to ask the students in their school.