Generally speaking, the self-taught questions are not too difficult, because I am a math major, so I feel it is not difficult. You must understand the knowledge points in the textbook and finish the following questions carefully. This is the most basic. I usually buy a pass, and I did all the questions at that time. I took several math tests, all of which were over ninety. You should be fine, too. I think it's better not to do too many questions, which is a waste of time. The key is to know what each type can do. I hope I can help you.