First, we must first find the reasons from ourselves. Maybe it's because we don't listen carefully in class. If we don't have classes, we can't go to the sky without trees. No matter how good the teacher speaks, no matter how simple the topic is, you can't do it without listening.

Second, there are teachers, and you may not be used to the way some teachers lecture, so you lose interest in mathematics. It is impossible to learn well.

Third, this is not a man-made reason. Maybe some children just started school and can't adapt. In such a concentrated learning environment, there is a gap in the understanding of some mathematical knowledge, and it is indeed difficult, but this does not mean that they can't learn mathematics well in the future. Maybe they can't turn around at this stage.

Fourth, he didn't develop a good learning method, just brushed the questions, didn't think and didn't summarize. We say that mathematics is just brushing questions. He has different calculation skills and methods for different knowledge points. As long as you master it, it is difficult to get high marks in mathematics according to the types of questions.

Another possibility is that you hate math and don't want to learn it, just because he hates himself and thinks he can't learn it. If you think you can't learn, you must have subjective initiative to get surprising results.