write a letter to your principal hilight the problems you have in the school and how they could be avoided

Dear Mr. (last name)

                 I don't know where to begin when asked to write to you about my problems here in school.  I can tell you this much, in that I deeply regret anything I said or did that caused disruption, whether it be in the classroom or on the grounds of (such and such High School).  I am going to make it my personal mission to better my character and my performance in school.  I am learning from my mistakes and I know I have a long journey ahead of me but, I assure you these problems will be amended.  Thank you for your patience.

                                                                               Sincerely,

                                                                                    (Name)

Explanation:

to save the day, harry must get past a scary three-headed guard dog.