1, pay attention to write down the teacher's after-class summary, which is very useful for condensing the content of a class, finding out the key points and the relationship between each part, mastering the basic concepts, formulas and theorems, finding the rules and integrating the classroom content. At the same time, many experienced teachers, when summing up after class, on the one hand inherit what they have learned, on the other hand assign preview tasks or point out what to learn later. Taking notes can master the initiative of learning, make preparations in advance, and make clear the objectives and tasks. It can also be more systematic when memorizing knowledge, which is helpful for memory and summary.

2. Reflection error. It is inevitable to make mistakes of one kind or another in the learning process. Write down your mistakes and mark them with a red pen to warn yourself. At the same time, you should also point out the causes of mistakes, correct ideas and methods, mature in reflection and improve in reflection. In this way, we will be deeply impressed next time we encounter similar problems.

3. You should also write down the questions you didn't understand in class in the notes of high school mathematics, so that after we write them down, we can consult teachers and classmates conveniently. We don't have time to think about these problems in class, so we can continue to think seriously after class, which can focus on memory and is conducive to the coherence of knowledge.