1, first you have to memorize the formula. It doesn't matter if you don't understand the meaning. The important thing is to remember it. When you can ask and recite, you can't forget it;

2. Understand the meaning of the formula one by one. On the basis of familiarity with reading, once you understand it, you will never forget it.

3. Read the examples in the book, analyze them thoroughly, and do a few simple questions, which will help you understand and use them flexibly;

4. It is suggested to find two or three difficult examples from the question bank and study the solutions well, which can broaden your horizons;

5. Try to do one or two difficult problems, but try to find a solution, without having to work out the final result and do practical training;

6. It is not recommended to engage in sea tactics. Here is a method for your reference: just "look" at a large number of question banks and only "solve" but not "answer". As long as you think clearly about the solution and thinking of each problem, you can go directly to the next one without wasting time, which is very effective.