<p>Since you're only a freshmen, your best bet is just to relax and go on doing things that you enjoy. Don't go searching for everything related to math because you think it will help you get into MIT in 3 years. If you're absolutely in love with math and can't get enough of it, then by all means, find whatever ways you can to enjoy it.</p>
<p>Basically, if you prepare for college by working hard in school and nourishing your passions, you'll be prepared for whatever. Plus, your activities can help you figure out where you want to go. If 3 years from now you realize your interests led you to join a Model UN and debate team- well, maybe those aren't all the impressive math competitions you think MIT wants to see, but hey, maybe by now you've realized you're more interested in law than engineering.</p>
<p>I'm not saying that you can't be well-rounded, or that joining Mock Trial means you don't like engineering. But this early in your high school career, if you just seek out activities that you enjoy, you'll be prepared for wherever it is your life leads you.</p>