I am studying. It's really hard. I have deep sympathy for you. First of all, it is very important to understand the basic concepts. You can't say that you don't know the volume formula of the cone, but you can still do the problem. Second, do more exercises and buy reference books. My math teacher said that I should spend at least 60 minutes doing math every day. Think more. If you can't figure it out in seven minutes, save time. Don't think about it. Look at the answer. Third, ask more questions and understand more. This is very important. Don't think you can't pass the exam just because of a small problem, and don't be lucky, otherwise you will be confident in the exam. Fourth, preview. Try to read everything in the book, so that when the teacher speaks, you will think more and think more. I have a deep understanding. Fifth, it is very important to be serious. I often make three mistakes when I do five geometry problems. My thinking is clear and I can do it, but my calculation is wrong, which has always depressed me. So you'd better check your stool when you're done. This habit should be cultivated slowly. These are my suggestions. As someone who has the same experience as you, I can only give so many ideas. As for how to learn, it's up to you. Good luck.