Classroom exercises, homework, tests and feedback should be consulted in time to analyze the reasons for the wrong questions. Is there anything wrong with the exam? Is the concept blurred? Time is tight, no time? Won't you do it? Don't let your carelessness succeed. If the thinking is correct and the calculation is wrong, correct it in time and strengthen the training of relevant calculation when necessary. Fuzzy concepts and mistakes in examining questions all indicate that you are prone to be ignorant in your study, which is a taboo in learning mathematics and should be resolutely overcome. As for what you can't do, of course, you should ask your classmates and teachers in time. Don't let the problem hang in the air. Get into the good habit of doing things today.