<p>Oxford has its own application, which is due Sept. 20 for US residents. You'll also need to file a UCAS form by (I think) Oct. 15.</p>
<p>That said, Oxford doesn't really care about extracurriculars, and they don't even want you to send your high school transcript until they review your test scores. Those, a teacher rec, and your personal statement, are all they see before they decide whether they want to interview you. Then, I think, you can show your transcript/EC resume etc.</p>