1. Choose an ideal tree for mathematics and buy a bound book. There are not many knowledge points in it, and the answers are divided into volumes. Answering questions is easy and there are many questions. Some problems only need to be written, and some problems only need to be thought of. If the method is right, it's over. If it is wrong, I will look back.
2, Qu Yixian's book is very good, suitable for top students, AB is not much different, the book published by Capital Normal University Press.