<p>1) Scientific research and dedicating lots of time to extracurriculars
2) Chemistry
3) In addition to taking advantage of the opportunities your school gives you, learn on your own, just for fun. The internet has a wealth of information on it - you can start [url=<a href=“http://www.math.gatech.edu/~cain/textbooks/onlinebooks.html]here[/url”>Online texts]here[/url</a>] or [url=<a href=“http://ocw.mit.edu/index.html]here[/url”>MIT OpenCourseWare | Free Online Course Materials]here[/url</a>]. 
Also, take some classes at whatever university/college is closest to you. Don’t waste away your summer!</p>