Judging from the ranking of mathematics majors, the top rankings are: Peking University, Fudan University, Nankai University, Zhejiang University, Beijing Normal University, University of Science and Technology of China, Sichuan University, Sun Yat-sen University, Jida University, Tsinghua, Xi Jiaotong-Shandong University, Shandong University, China Normal University, Wuhan University, Dalian University of Technology, Shanghai University, Soviet University, Shoushi Normal University, Tongji University, Lanzhou University, University of Science and Technology of China, Nanda University. Different tutors have different research directions and reputations, so the difficulty of postgraduate entrance examination will be different. Schools will also have an impact on the postgraduate entrance examination because of their fame and geographical location. Therefore, we should first look at the specific research direction of the major we want to take, and then compare them separately to see which one is most suitable for our own examination.