One problem: None of my interviews required me to write an essay. But then again, I've only done just two interviews.
However, have you not taken the Composition (english) course/prereq? It teaches you the basics of essay writing. And that included paragraphing etc. Formatting, if I'm not mistaken, is mainly for research papers. I don't think it's required for the basic essay...again, I could be wrong.
Nonetheless, I'm no english professor/tutor, but here is the little I know about writing essays.
1. Must contain a minimum of five paragraphs. First paragraph should be for introducing or stating your main thesis; and listing out points you will be using to support that thesis (at least list out three points).
2. The second through fourth paragraph should be used to elaborate on those (three) points you listed in paragraph one. It does not have to stop at three. But I use at least three just to meet up the five minimum paragraph rule - for the sake of timed tests (like the accursed PCAT). Otherwise, you can list as much points/paragraphs as you see fit for your essay.
3. Then the final paragraph should always be used for summarizing your whole essay.
4. Good grammar & punctuations - inevitable for a good essay. Accurate, not random, vocabularies - not really really necessary...but always a significant bonus.
5. I would ultimately suggest setting up a quick review session with an english tutor/professor from any school or something. Write a couple of practice essays & have them review it for you. They'll be in a better position to better horn your essay skills than random throw-ins from an online forum, supposedly.
I hope that helps...best of luck👍