[Sorry for not paying attention in class]

Dear Mr. Wan,
I am really sorry for not paying attention in class and repeated the same questioned asked. I hope that you would forgive me as I promise I would not repeat the same mistake again. I know that as a vice-head prefect, I should not be setting this kind of behaviour in class. As they say, we always learn from our mistakes. I really hope that you would accept my apology.