When I was in high school, I bought a three-year simulated five-year college entrance examination for the first time. Later, I learned this tutorial book very well as soon as I learned it. Then I bought compulsory one to compulsory five, as well as elective ones. It is basic, medium and difficult, and the problem analysis is also very detailed. If you really don't understand, ask the teacher. It is a good tutorial book for your reference.

Also, math can't be done in a hurry. You can't expect you to do it once or twice, and then this problem will be solved. Take your time, don't worry! You're still teaching yourself. That's awesome!