I don't need to teach you the format. Talk about the content. You mainly write about what mistakes you made. Then you said you shouldn't violate the school rules, regardless of the school rules. How to correct mistakes after recognizing them? If you want to study hard, don't write about sleeping with your girlfriend, otherwise it will affect your reputation. Make up more nonsense, just ask for more words, not content, and have a good attitude of admitting mistakes. School teachers are human. As for you, things like that are generally not too difficult, but you need to take the initiative to admit your mistakes or have a better attitude when criticizing you. At the end of the criticism letter, you should make sure that this kind of thing won't happen again. Don't sleep in the dormitory next time. It's not safe. It's best to go out and get a room. It doesn't cost much, and you don't have to worry.