<p>If family schedules cause you not to be able to do science activities after school, then be sure to mention it, and mention in your essay how you pursue math/science activities on your own. It’s not going to kill you. I think you show a fairly strong passion for math science just due to the nature of your course load. </p>
<p>The key is that you still do lots of science “stuff” (you didn’t really specify), just not through your school. If you want to do those clubs, then do them. I you don’t, or can’t, then don’t.</p>