Generally take the exam first? A 1? Mathematics, the content of this subject is the foundation of other disciplines. Other subjects can be based on their own situation, depending on the major. If you are from a financial college, then A4? Economics and A7? Accounting and finance should be easy for you. Of course, these two subjects are relatively easy among the eight quasi-fine subjects. If you study finance, A2 financial mathematics should also be easy. As for other subjects, it shouldn't be difficult if you have studied science.
You just finished the postgraduate exam, so you should have no problem with math. Mathematics is mainly probability theory and mathematical statistics, as well as some random processes. It is not very difficult for undergraduate students to take A 1 Mathematics and A4 Economics for the first time.