<p>Junior year, I took an AP in a course which my school did not offer an 'AP Class' for (only provided an 'Honors' class), and I subsequently received a 3 as I only had learned about half the material on the exam.</p>
<p>I figure that I can self study what I still need to learn and receive a better score senior year so that I can use it to waive a requirement in college.</p>
<p>Are you allowed to take an AP exam which you have already taken?</p>