Learning math is the same as weaving a web. You have to twist the thread before you can weave the net. In other words, you must lay a good foundation for threading. Key classes must be previewed before class, so as to follow the class. The efficiency of learning math class is very important. Secondly, if you do more problems, you will naturally have ideas to solve them. Come on, high school math is not difficult, and it is not good for math.