Nowadays, books are generally written for postgraduate entrance examination, and there are not many real after-school exercises.
I recommend some other books to you. Although it is not used for postgraduate entrance examination, it can also be used as an exercise. Generally, it is written according to calculus, probability statistics and linear algebra. Calculus is the main part. Anyway, probability statistics and linear algebra should be learned in the future, and it will not be wasted if you buy them.
The following books have detailed answers and are recommended to you:
1500 detailed explanation of objective questions in mathematics for postgraduate entrance examination, edited by Cai.
Detailed explanation of 500 subjective questions that must be done in mathematics for postgraduate entrance examination, edited by Cai.
Li Yongle, Li Zhengyuan, editor-in-chief of the postgraduate entrance examination mathematics review book.