How do you write a letter to your principal telling him three problems facing in the school?

You know, AGODEY ERNEST , this is your homework. The answer expected of you will be based upon whatever you have been told in class. I wasn't there. I have no clue what your teacher will be looking for.

Because this is not a realistic question. If you are facing problems at school the normal recourse is to approach your form tutor, or whoever provides pastoral care, and talk about it. And in what deranged universe would you wait until you had accumulated exactly three grievences?

If you have been set a writing exercise you need to do it yourself. That's the only way to practice and to learn skills. Cheating teaches you nothing.