First, we must first understand and remember the theoretical knowledge in class. For example, the special trigonometric function values in trigonometric functions must be kept in mind, and the volume formulas of vertebral bodies and cylinders are also necessary. The second is to brush the questions. I think it is necessary to brush the questions. Let's take the series as an explanation. You can't say that mathematical induction can solve all the sequence problems, let alone the time problem. Some problems can't be done by mathematical induction at all. In this regard, you have to do more, use the topic to broaden your horizons, understand your own ideas, sort out the ideas for solving problems, know why you solve them so, and then think. Then, when you meet different body shapes, you won't be confused or even think about it. And brushing the questions can make you master some basic knowledge and then understand it yourself. Third, the wrong book. Forming the habit of making mistakes can help you find out where your mistakes are when solving problems. At this time, you should think deeply about why you made such a mistake and what you should do next time to avoid it. Learning mathematics is a long and lasting process. Its road may be full of thorns, but there are always flowers waiting for you to find and pick. This is the sense of achievement in learning mathematics. You will understand the hearty feeling of spending an hour or two trying to solve a problem, and then you will be fascinated. When you fall in love with this feeling, mathematics will become your strong point.