First you say sorry. Then you say what you are sorry for. You should also say that you won't do it again. You should write the date and your first and last name. I would also write sorry again. Hope this helped.
Dear teacher,
I am sorry for getting bad grades, and doing poorly on my tests. I know that I shouldn't play around anymore, and take this seriously. I will make sure that I focus more on my tests and etc. I also hope that u forgive me, and keep my word.
Hope this helps!!!
