<p>It’s never “too late” to do ECs and no one ever “needs” to do ECs unless it’s a graduation requirement. Your question is, what should I do to maximize my appeal to colleges, operating on the false assumption that admissions officers can’t distinguish between nominal involvement and actual involvement.</p>
<p>Find something you enjoy doing and do it; participate a lot in it and acquire some responsibilities. That is how to handle ECs.</p>