How to write the guarantee of re-studying after a period of suspension?

I thought calmly for a long time. The mistake I made this time not only caused me trouble, but also delayed my class, because I couldn't go back to school to have a normal class like other students. Moreover, my behavior has also caused a bad influence on the school, destroyed the management system of the school, and also caused a bad influence among my classmates. Because of my own mistakes, other students may follow suit, affecting class discipline and grade discipline, which is also a kind of destruction to school discipline, a kind of harm to teachers and parents who have great expectations for themselves, and an irresponsibility to other students' parents. Every school wants its students to achieve excellent academic performance, develop in an all-round way and establish a good image, which also gives our school a good image. Every student also wants the school to give him a good learning environment to study and live. Including myself, I also hope to have a good learning environment, but a good learning environment depends on everyone's common maintenance. But I made a mistake this time and ruined the good environment of the school. Very inappropriate. If every student makes such mistakes, there will be no good learning environment. It is also right to punish students who violate school rules. I stayed at home for half a month and thought about it myself. I also realized that I had made a serious mistake. I know I should pay the price for my mistake, and I am willing to bear the responsibility that I can't afford, especially as an educated person in a key university, I should bear the unshirkable main responsibility for this mistake. I sincerely accept criticism and am willing to accept the treatment given by the school. ....