Generally speaking, freshmen study in the first semester and then study for one year. But it is also possible to start studying next semester, and there must be linear algebra and probability theory.

It depends on which school when you take the postgraduate entrance examination. For example, the management of Shanghai Jiaotong University is to test mathematics! For you, there are many mathematics experts in science and engineering who are interdisciplinary in the postgraduate entrance examination, so the competition is fierce and the success or failure lies in mathematics.