Get the third person thing down. SO many candidates screw up and say "I", "him", "them", etc. If it's a first person pronoun don't use it. When you talk to people between now and OCS, think of how you'd say it at OCS. It's one of those things that will keep you from becoming some SI's "project" from pickup onward.
For the essays, write about a paragraph at a time and then number/underline the words. You'll keep your flow much better. Reminds me of an essay I had to write in red black and blue ink. And after I turned it in, I had to rewrite it for making it look like a rainbow. Also, take the subject of your essay and apply it to something you already know about. DON'T mention your instructors at all in your essay. It seems like a pretty obvious thing to not do, but I went and did it anyway, and I got myself another ass-chewing and a re-write.
For the essays, write about a paragraph at a time and then number/underline the words. You'll keep your flow much better. Reminds me of an essay I had to write in red black and blue ink. And after I turned it in, I had to rewrite it for making it look like a rainbow. Also, take the subject of your essay and apply it to something you already know about. DON'T mention your instructors at all in your essay. It seems like a pretty obvious thing to not do, but I went and did it anyway, and I got myself another ass-chewing and a re-write.