Because if you don't have a good review foundation, the later review will be very difficult and a little anxious. Laying the foundation is the most important thing. You should understand the knowledge points and basic questions, and then deepen the difficulty. It doesn't mean that you must follow the teacher's progress. You can make a plan for yourself and list the knowledge points and questions to review today. Doing it yourself does not mean stubbornness, but represents a kind of intelligence and efficiency. And you don't fully understand the basic things, and then do the difficult problems directly, and you don't know the principle at all. It may even be that you got the basic questions that you didn't have time to estimate in the college entrance examination.