Function, limit, continuity
Differential calculus of univariate function
Integral calculus of unary function
Multivariate function integral calculus
infinite series
Ordinary differential equations and difference equations
So you can also see that advanced mathematics is generalized calculus, with some series and ordinary differential contents.
As for the degree of mastery, I suggest you buy a number three postgraduate counseling book (such as Li Er's math review book and other books with good reputation) and study and train by the chapter. This is not a question that can be clearly stated in a few words.
If the foundation is really not good and it is difficult to read the reviewed textbooks directly, then try to start with the textbooks, do some basic after-school exercises and master the knowledge points. You can also buy some basic guidance books. For example, Chen Wendeng's core lecture notes are also word-of-mouth goods (note that it is not a review guide, which is more difficult). It is also a good choice to download some basic course videos of training schools online.
Finally, don't think that 85~90 in math test is enough. Try to understand and master the content of the review counseling book within your own ability. After all, the postgraduate entrance examination is very variable.