I use this exact letter every year, and it works like a charm. I just change my teachers name and the info in the top right corner and wabaam. They bump me up if they can to a higher grade and recommend me to other teachers.
Dear Mrs. -----------------
I can honestly say I am sorry that my behavior this year has been unsatisfactory. I recognize that I did not participate enough in your class this year, and when I did participate the majority of my participation consisted of non-productive comments that were not beneficial to the learning environment or other students. I am trying to improve, hopefully in time for next year’s classes, and I understand how I affected you, my other teachers, and my fellow classmates. I also understand that if I do not change my presumptuous and vain attitude it will affect my work and personal life as an adult.
I know I do a facial expression where I lift my eyebrows and close my left eye and it gives off a condescending vibe. I am sorry; I know it comes off as really disrespectful and cocky. I am trying to work on replacing it with a less egotistical expression.
Thank you very much for still tolerating me this year despite my nonchalant attitude in class. Your one of the best teachers I have ever had, and your methods or studying and remembering were very helpful. I was just having a rough year this year and did not really get to appreciate your teaching skills in all their entirety, and for that, I am ashamed.
Seth Skyler -------------
She paints a pretty picture, but the story has a twist, the paint brush is a razor, and the canvas is her wrist.
You write all that up and use a thesaurus to get similar words that sound better and make yourself look more intelligent and yet after all this work, you still can't work out the difference between "Your" and "You're"...