Through the experience and lessons of this exam mistake, I think we should be serious in our future study and check carefully in the exam to avoid making the same mistake again. Learning is not only learning knowledge, but also an opportunity to cultivate good habits. If you study now, you will be careless, and later you will make mistakes in your research and work, and it will be too late to make up for them. I'm still young, and it's not too late to correct these problems. I hope the teacher can forgive me, and I will-I will turn over a new leaf, study hard, and strive to be a rigorous and serious student in my future study and life.