Pay special attention to the body paragraphs. Be sure they are fully developed and offer the reader adequate detail. Most unsatisfactory essays fail because of this one short-coming. Make sure your body paragraphs are unified and contain no irrelevancies. Check your use of transitional devices both within and between paragraphs.
Expression Read the paper backwards, one sentence at a time.
This technique will keep your eye from running over material that seems familiar. Make several passes, looking only for certain problems. Be sure you have employed the right mix of tone, variety, and diction so you will neither bore nor distract your audience. If possible, read the paper aloud either to yourself or to someone else. The ear sometimes finds errors in syntax better than the eye.