I think this question seems careless. In fact, it is because the foundation is not solid, or I feel that my psychology is not solid. Therefore, I will unconsciously seek speed during the exam. It seems that I want to check it again after I finish it, but in fact I have forgotten what seems to be wrong with a question after you finish it. Therefore, I suggest that when you take the exam, you should finish an examination and try to use different methods to detect it, so as to avoid the situation that the same idea itself is wrong, and then check it again. Of course, you should throw it away after confirming it is correct, and never mind it again, as if you had got the score of this question. It is good for you to relax more. In addition, we are now trying to be quick and steady in the exam, skipping the questions without ideas directly, simply checking the rest of the time and starting to study the difficult ones. Now, if you can still find a way, review the basics again. If you can't, do more questions yourself and take more time to make yourself feel that you can answer these questions correctly and give your heart a hint. Then slowly increase the speed and slowly overcome the psychological obstacles, and it will be fine. Your problem is caused by nervousness, although it seems to be an careless problem. Because I used to be like this, but there was no such problem in physics at that time. Later, after careful consideration, I found this problem. After I changed it, math was much better. Although it is not close to the perfect score, it still has 120.