I suggest you read the textbook first, and then review the whole book. Only by laying a solid foundation and mastering the theory can we cope with the ever-changing sea of questions. If you don't have much time, you can do different types of questions in the book, and there is no need to repeat the same type of questions. Remember: the method is the most important, the tactics of asking questions is not a good method, and the basic questions of postgraduate entrance examination still account for a large proportion. Good luck.