I suggest you buy a supplementary book called "Top Students' Learning Plan". I have used it for children, and there are many difficult and expanding problems in it. There are several columns that I think are very suitable for you. The first is the multi-dimensional problem-solving strategy, the second is the experience of scoring experts, and the third is the warning of error-prone and chaotic. What is included here are the independent enrollment questions and the original questions of the senior high school entrance examination. I suggest you look in the bookstore. In addition, if you do the questions, you can find "General Practitioner Classroom Practice" or "Textbook Practice". "Famous school classroom" is also good. "General Practitioner King" is slightly more difficult.