If you are not serious, you must correct your learning attitude. Many people learn mathematics with a high eye and a low hand. They often hold a state of mind. What else can they do with such a simple topic? Actually, doing and watching are two different things. Although the topic is simple, we should do it with a correct attitude. A math problem will be graded by the teacher only if you do it right. If you do something wrong, the teacher won't grade you, even if you can do it. Therefore, if we look at mathematics according to this attitude, we must establish the idea that we will not do it as long as we do something wrong. In addition, it is important to read the questions clearly before doing them.