In fact, for me, mathematics is a hobby, so I have been interested in similar mathematics since I was a child. Mathematics pays attention to two points (I think) 1. The combination of numbers and shapes, the use of associative memory in coordinate equations (in fact, many things in mathematics need to be memorized in order to be used freely. Of course I have to recite it. It's understandable. After all, the examination time is limited, so you should recite something that you think is useful and capable. Don't memorize. 2. There is nothing to say if you can find the rules. The main thing is to distinguish the types of questions and master the methods of various types of questions, so that's all. (* The above two points are equally applicable to any other subject. *) Finally, it is easy to say that what a high school student doesn't usually use but is very useful in the field of mathematics is "concept". This method takes a long time to hone. )