What is the format of letter to the principal?

f you have a contact person that you are writing to, the letter should be addressed to him or her. Your letters need an appropriate greeting and closing. Each paragraph of your letter should be focused and include detailed information on why you are writing. In the final paragraph of your letter thank the person you are writing to for considering your request.

Don't forget to include your contact information - full name, address, phone number, and email address - so it's easy for the reader to connect with you.