<p>Also the paragraph below has info from their site regarding a-levels...basically you'd have to contact the individual college directly to find out what their American equivalents are...you are not expected to sit A-level exams on top of your high school credentials.</p>
<p>Generally, you need to have, or expect to obtain, qualifications equivalent to three full A-levels. However, students from all over the world apply to Oxford and from a wide variety of educational backgrounds, and colleges are experienced in assisting applicants with a range of qualifications. If you are in any doubt, it is best to speak to the Oxford Colleges Admissions Office or to the Tutor for Admissions at your college of preference.</p>