If it is at this stage, I suggest you use some basic counseling books. For example, The Complete Solution of New Textbooks is a supplementary book that emphasizes explanation. If you want to improve your grades, you should mainly learn the knowledge points in the textbook. It will only be used, and the results will naturally be brought up; This book mainly talks about those knowledge points, and the knowledge points, mistakes and difficulties that teachers often bring in class are all detailed. hope this helps