First, I like your statement, as it indicates your have had the SA desire for sometime now. It's fine to ask how to make you stand out...but keep in mind, whatever you do for extra cariccula activities, it should be for the fun/expierence in things you like. OK, so successful candidates to the SA's vary in their total profile quite a bit. Heres some general advice: take hard courses (Pre-AP, AP, Honors, etc). Try to get as much AP math and science as you can (3 or 4 lab sciences are good), Calculus A, B, statistics. Talk to your teachers about how you can do better, ask for their advice. Help other students, particiapate in sports, Varsity is good. Its generally better to stick with one or two sports than to do a few. Seek and leadership opportunities in ECAs, sports, etc. Find a community service org. that you would like to volunteer in. If your in Scouts...continue, if not thats ok. Most of all try to have fun, stay fit. There is debate as to when to reach out to your favorite SA RC or BGO etc. My opinion is that it doesn't hurt to do it early. others will have good advise. Nice job!