Letter to your Principal for arranging extra coaching classes.

The Principal
school name, address
May 16, 20_ __
Respected Sir,
I, on behalf of the students of class X, request you to arrange for extra classes to complete our courses in science and mathematics well in the time.
We lag behind because we were unlucky to have regular teachers. It is the month of November and courses in these subjects are yet to be finished. With extra coaching classes we will be able to complete these courses comfortably before the board examination. If required we are ready to pay extra amount as per your decision. Please help us and realising our difficulties make arrangement for extra coaching classes.
Thanking you in anticipation.
Yours obediently.
your name
Class x