How about using "Xiao Gan" in high school textbooks? Or is it easy to use the "Xueba Notes" of the green card book? Or what? Ask the high school teacher or the elder brothers and sisters after the last college entrance examination for advice. The knowledge points given by Xiao Gan are relatively simple and clear, and the Xueba notes are more detailed (the Xueba notes I use are very thick and large). Actually, any book is good. The most important thing is that you can remember all the knowledge points, preferably by heart. If you are a liberal arts student, you might as well recite more and help you do some exercises. If you are a science student, remember the knowledge points and do more exercises.