Proofread and revise your essay

You write, then you proofread. Check if you use best appropriate words. If you can omit any, go ahead and remove them. If you feel an idea is incomplete, go ahead and add something.

Proofread and revise

Then proofread, proofread, proofread, again and again. Revise, revise, and revise. If you have free time before submission, read once more and revise. Unfortunately, there is no essay in the world that is perfect. Each essay can be improved, therefore don't think that there is nothing to improve in your essay. Proofread and revise once more.