<p>I'm applying to colleges this fall as a math/CS major, depending on how hard it is to transfer to the CS major at a particular school, and so far, my ECs are a bit mediocre:</p>
<ul>
<li>piano for at least 8 years</li>
<li>admin of our school's unofficial web portal since 9th grade</li>
<li>member of math and anime clubs, but no leadership positions</li>
<li>minor awards in math/science competitions; varsity captain in an engineering competition, but we didn't do very well</li>
<li>bunch of math/science summer programs and online classes</li>
<li>did physics research at UIowa this summer</li>
<li>if it counts, self-studied a total of 7 AP exams, got 5s on all (notably Calculus BC, Comp Sci A, Physics B, Physics C: Mechanics) except Physics C: E&M. Self-studying both Econs this year.</li>
</ul>
<p>This year, I am preparing for AMC/AIME (aiming for USAMO), and USPhO (aiming for semifinals, probably not the team). I'm also studying an intro CS course using MIT OCW, and possibly an introduction to analysis (what most math majors learn sophomore or junior year) textbook on my own.</p>
<p>How will ECs I start in senior year affect college admissions? I'm looking into joining the robotics team. I didn't join before because I didn't have any sort of experience with engineering or programming and I wasn't confident in my ability to learn on the go. (I regret that now...) Hopefully, I can also volunteer at the local library - the program is somewhat selective, and I got rejected for last fall, so I'm not sure how I'll fare this time. Joining some random interesting clubs may be in the works as well. :P Team science competitions aren't an option for various reasons.</p>
<p>(My list of schools is [url=<a href="http://talk.collegeconfidential.com/high-school-life/1089752-class-2012-where-you-applying-40.html#post12992198%5Dhere%5B/url">http://talk.collegeconfidential.com/high-school-life/1089752-class-2012-where-you-applying-40.html#post12992198]here[/url</a>], if relevant. I'm applying to top 20ish universities.)</p>