Nothing else to do - keep reviewing FA, do more UWORLD questions.
Review non-stop for about a week, do NBME at the end of that first week. After your first NBME, look for your weak areas and spend a week focusing solely on those weak areas.
Take another NBME. Regardless of what your grade is, after the results on that NBME, just keep reviewing non-stop.
TRY NOT TO FREAK OUT.
If you psych yourself out and go in there with low confidence and discouraged, you'll do a lot worse.
The more you review now (and review heavily), the more confident you'll feel going into the test. The more confident you feel, the better you will do.
Good luck!