According to your situation, there will be different choices.

If you don't have a clear grasp of the knowledge points, don't know when to do the problem (ordinary intermediate problem), don't know which knowledge points to use, don't know the specific contents of the knowledge points, and don't know the specific methods to do the problem, I suggest you buy a reference book, which can be used in five or three Longmen, as long as there are knowledge points, but books alone are not enough. You'd better find a teacher to make up for it and consolidate the knowledge points. At first, it's best to pay attention to knowledge points and do some exercises in combination with basic questions.

If you have been able to do intermediate questions without too much pressure and basically know how to use them, it will be simple. You just need to buy a book that practices a little more, such as May 3rd, limited time training, crazy exercises in minor issues, etc. And don't spend too much energy on knowledge points, just do the questions. When you do a problem, treat it as an exam and ask yourself to do it well. If you can't, think carefully before looking at the answer. It is suggested to take a break, check the answers to each set of multiple-choice questions, or do three or four solutions (excluding analytic geometry and finale), or one or two complicated geometric or finale questions.

If you can fluently know the solution ideas of all intermediate and high-level questions except the last one, and you can also know the general direction at a glance for simple questions, then you'd better train your cautious thinking, find some intermediate and high-level questions and download some math multiple-choice questions online. I downloaded a few, some of them are still difficult, keeping the feeling of doing the problem and the fluency of thinking, and at the same time being active in the thinking ability of tackling difficulties.

If you have exceeded all the levels listed above. Ask me. . . . .

I wish you success in math!