Make sure you addressed the topic. Rewrite any parts of your paper which might be difficult to understand. Your instructor can read your words, but not your mind. Correct errors in grammar, spelling, and typing. Using a spell-checker on your computer is highly recommended.
Sloppy writing can hide good clear thought.
Language is your only means of expression in these papers, so it is very important to use it in a way that will help you, not hinder you, in communicating your ideas. Papers are due at the date and time specified. After that papers will be considered late and will be penalized. If you foresee special difficulties with the deadline, speak to the instructor well in advance.