Actually, there is a very simple method. . Just use a single soft copy to record the same wrong question, which is only a few dozen or twenty pages thin. It's not too expensive to finish anyway. Even if you bring a lot of copies, you won't feel heavy. . I used to do this in high school. . . Wrong problem handling. . This will vary from person to person. . I just cut and paste the questions first, then write down my wrong answers and process, and indicate the reasons for the mistakes, whether they are careless or unclear, and then copy down the correct answers and write my own reflections on doing such questions. You can try it. . .