<p>One clarification for those who may not know too much about IB: The IB diploma requires exams in six IB subjects. At least three of these must be at High Level (HL). However, you can choose to take four at HL, and two at Standard Level (SL). HL exams can only be taken in the senior year.</p>
<p>As others have said, IB is a more integrated curriculum, whereas AP is more of a course-by-course thing.</p>