This is normal, and I don't need to worry too much. I often have this situation in high school. I think there are two reasons. One is that I don't pay enough attention when I do the problem, and I often don't know where I'm going when I do it. The other is my mentality. Once you pay close attention to the exam, you will feel different and embarrassed. My suggestion is two points. First of all, I should constantly urge myself to develop good study habits. Secondly, I want to learn to relax and relax my heart.