You're eager. You know you need to revise more. But it's written all the way to the end. Your BFF says it's perfect. Your mom says you're the next J.K Rowling. Your palms sweat. You're finger is on the button ready to click "send".
Don't do it!
Because chances are, it's not ready. You're not ready. And you don't want to make an a$$ out of yourself by submitting something that isn't ready. If you win the contest, or if the agent requests pages, then what? You send something half-assed and then ask to revise and resubmit. You've wasted said agent/editor's time and you are EXTREMELY lucky if she/he doesn't tell you to go to someplace not nice.
Trust me. Don't do it.
Breathe. Revise. Rewrite. Repeat.
You'll know when it's ready.