There are many functions in the wrong problem book of high school mathematics. The first is a process of reflection and re-recognition. By sorting out the wrong questions again, you can familiarize yourself with the causes of the mistakes and the correct solutions, and then improve yourself. Secondly, you can review the wrong questions and learn new ones. You often look back at your mistakes and see where you left off, so that you can always remind yourself of such problems and avoid making mistakes next time. Finally, the wrong question book is also a good helper for reviewing before the exam.