Mathematics 1 and 2 are science and engineering mathematics, and mathematics 3 and 4 are economic mathematics. The two have different emphases. Number one is the most difficult and has the widest range of tests, including advanced mathematics, probability theory and mathematical statistics, and linear algebra. The number two is much simpler, and probability theory and mathematical statistics are not tested.
It's easier to count three to four, but it's necessary to test probability theory and mathematical statistics. Of course, in addition, there are professional mathematics in the postgraduate entrance examination. I want to take the math major, but I don't want to take these exams. You take advanced algebra and mathematical analysis, and the topics are decided by each college.