<p>Is it possible to revise the extracuricular activity section by sending a letter after you submitted the application? Cause it says you can revise it by mail, but I don’t know if that’s only for address change or what.</p>
<p>Yes, you can update/revise/amend anything in your app. But to do so, make sure it’s a meaningful change (not just fix simple typos, for example), and you must send a letter to each campus to which you applied.</p>
<p>To each campus applied? Or just sending the letter to the admission office?</p>
<p>Sent the letter to the admissions office of each school applied to. The UC processing service apparently just routes the application after it is received and makes sure that you give truthful information.</p>