The probability of retaking the exam has no fixed standard value, but depends on the individual's learning attitude, review preparation and effort. Generally speaking, if a person takes the course seriously, finishes his homework in time, actively participates in class discussion, and makes full review and preparation before the exam, the possibility of making up the exam will be greatly reduced. On the contrary, if a person does not study hard enough, is not fully prepared, or has a big blind spot in the exam content, then the possibility of making up the exam will increase. Therefore, make-up exams should be avoided as much as possible, and students are advised to maintain good study habits, plan review plans in advance, attach importance to classroom learning, and actively participate in discussions.