Textbooks are very basic things, and teachers will not explain them in depth, but the learning process should be divided into at least two parts. One is to remember the basic knowledge, and the other is to learn how to break down complex problems into simple ones. I believe many teachers will do this when explaining the latter. LZ can pay more attention to the teacher's process of analyzing test questions in class, or pay more attention to the process of analysis at ordinary times, and break a difficult problem into many small problems, and it will be more than half successful.