If the math foundation is not good enough at first, I suggest reading the book first. No matter how difficult the exam is, it is always inseparable. That is the textbook, and even some basic topics are selected from the exercises after the chapters of the textbook or formed after slight changes. When reading textbooks, pay attention to the key points, I mean the basic definitions, concepts, formulas, principles and so on. The examples cited in textbooks are often very representative. First you have to understand it, and then you have to do it yourself. This was not in vain. Although I know the answer, I don't necessarily know the derivation process. In the process of doing it yourself, you are also further understanding the meaning of the formula. Because you don't have a systematic grasp of the basic questions, I suggest you focus on the basic questions when practicing. In a difficult test paper, we usually have a ratio of 7:2: 1, in which 7 is 70% of the basic questions, 2 is 20% of the moderately difficult questions, and the remaining 1 is really difficult 10% (this part of the score is for really difficult people). After reading each chapter, do targeted exercises. How to pay attention to pertinence is to find reference materials to teach you to master the questions, rather than simulation questions and exercises. Those references will teach you step by step how to master one typical question type after another and the corresponding answer methods. It is suggested that if you are used to it, you should copy down the typical questions and the questions that often make mistakes in practice as the most important and valuable experience in the final review.
Good review methods, good reference materials, and your own diligence, I believe you can succeed. When you master the method, you will find that no matter how you change any topic, it is just another change. As long as you know the law of solving problems, you are not afraid of how it will change. Good luck ~