Dear Problem Boy,
I am truly sorry things did not work out for you at Packemin HS this term. No matter what you might think of me, please know that I only wanted to help you succeed and to watch you graduate. I know there is an intelligent young man buried somewhere within you and I hope your new school helps you find him.
You have a wonderful family who loves you deeply. I know they will do everything they can to help you find yourself and to be happy.
(I intend to mail this to him. Of course I will use his real name, not Problem Boy.)