Hi! I think your GPA and ranking can qualify you for Duke, but you should definitely consider improving your ACT or SAT. There are still a few more SAT / ACT tests offered before college app season begins. Good luck!
Chance me back? http://talk.collegeconfidential.com/what-my-chances/1968508-chance-me-for-selective-top-schools-ill-chance-back.html#latest