http://talk.collegeconfidential.com/discussion/comment/20804816#Comment_20804816
water polo 
My country doesn’t have a lot of opportunities aside from Olympiads in physics. No research opportunities or such.
Then, use water polo. Look for Universities with teams, go to “water polo prospective recruit”, describe your achievements and also contact the coach directly. Do this now as the season has advanced already.
Very few universities and colleges will guarantee to meet full need. Any reason you are not considering MIT? They are very generous. Same goes for Amherst and Princeton. I would definitely apply to those three universities.