First, the basic knowledge of mathematics is not solid. The formula behind this has no memory, no understanding, and it is swallowed.

Second, there is no programmed thinking. How to understand the problem and how to deduce it from the known conditions requires mastering the thinking process of solving the problem, that is, the mathematical model. In addition, there are too few exercises and brush questions, and the problem-solving mode is not mastered and understood, so it is easy to make mistakes in chaos. This is what many people call a bad habit of solving problems. We dissect deeply, and the essence is programmed thinking.

Third, there is no stable positive attitude. Being too nervous during the exam, doing this question, thinking about the previous question or the latter question, and not paying attention will distract your energy and cause calculation errors.