2, the national unified examination subject preparation can refer to the unified examination outline. Generally speaking, you can use the general textbooks of universities, because the basic principles are similar. The key point of learning is to master the basic principles, theories and methods, and learn to use theories and methods to analyze and solve problems.
3, don't care about reference books, because the score line is based on the standard of a single subject, so the key is to try to improve the total score and see which parts or subjects you can improve your score in each subject.