English Proficiency Letter - writing ideas?

Hi guys,
I need to write a letter that should be signed by my prof. to proof that all instructions in my college are by English.
What should I write?

Maybe you should write about the instructions in your college. Remember this:
one paragraph = one idea
one good sentence can be turned into a paragraph with a few sentences of explanation and example.
one essay = one BIG idea made up of the smaller ideas in the pararaphs.
The BIG idea of the whole essay is given in the last sentence of the first paragraph.

I can't wait to see what you write! :-)