<p>Just wondering, if one of my peers decides to, at the last moment, not to take a certain AP exam, can I fill in that empty spot and take it instead? </p>
<p>Note: I’m not taking it for him, but for my own score. There are extra labels in the AP booklet that I can use, and I doubt that CollegeBoard gets a list of everybody registered for each exam (seems like an impossible feat to match so many test takers).</p>