Under normal circumstances, between the first, second and third unified examinations of mathematics and between the first and second unified examinations of English, you can change from high to low, but not from low to high. For example, math 1 can be transferred to math 2, and English 1 can be transferred to English 2, and it is not allowed to be reversed; Candidates who do not take the math test cannot transfer to a school (college) to take the math test.

Generally speaking, when the postgraduate entrance examination is adjusted, the relevant majors of the school who want to take the preliminary examination of mathematics may tend to ask the students who have taken the preliminary examination of mathematics. The details need to be verified in the official notices of relevant schools and related majors.