Question

On what size of a paper I should write an application to the principal

Answer 1

Hello!!

Ideally applications should be written on A-4 size page.

Answer 2

It's a formal practice to write an application to the principal or some other higher authority individual on a plain A4 size paper. You should maintain a margin of 3cm both at the sides as well as the top and bottom. Also, maintain proper indention while writing.

Thanks