Today, I write this critical letter to you with guilt and regret to express my shame that I didn't do well in this math exam. This is a very profound exam. I am ashamed of the mistake I made this time. I really shouldn't have failed to review carefully before the exam, to do the questions seriously during the exam, and to check carefully after the exam. I feel very sorry. I hope the teacher can forgive my mistake. My confession this time is really profound. Making such a mistake is also a great blow to my parents' expectations of me. Parents work hard to make money so that our children can live a better life and we can devote ourselves to study. However, I went against my parents' wishes. I made such a mistake, which is simply a painstaking denial of my parents. I'm ashamed of it, too. The fatigue of parents is unknown to us. They are busy every day to survive and bear a huge burden for their families. I hope the teacher can forgive me and recognize my attitude of admitting mistakes. I really deeply reflected on my mistakes. I hope the teacher will give me another chance to correct my mistake.

I hope the teacher can forgive my mistake. I can assure my teacher that I won't do so badly in the exam in the future. I assure you that it won't happen again.

At present, there are 437 words. When writing, add a little test paper analysis (such as which side loses more points), and it will be almost the same. Hope to adopt!