<p>I also do the British system and as far as I know, the O-Levels/GCSEs will not get you into any university. You do them at the end of year 11 (sophmore year). </p>
<p>You need at least 3 A-Levels by the end of year 13 to get into uni but you apply with your 4 AS-Levels.</p>
<p>I would really suggest finishing school because it's only 3 months right? And a high school diploma is something you generally need in life (unless you have a degree - then again, you need the HS diploma to get a degree).</p>
<p>Ok I'm going off topic here. Hope I helped in ANY way.</p>