How to write an application to your school principal to permit you to change your optional subject?

To

The Principal

Modern Public School

Location

Sir,

With due respect, I beg to say that I am a student of Class IX of your school. I took up Mathematics as my optional subject. But I am very week in health. I am unable to labour hard on Mathematics. In the half-yearly examination I got only 30 per cent marks in it. I think that optional History will be better for me.

Therefore, I pray that you will be kind enough to permit me this change and oblige.

Your Obedient Student

Your Name

Class IX