Canceling AP test before taking it?!!

<p>Hey everyone, </p>

<p>I signed up for the AP Macroecon test, but I haven't had the chance to study the material.
I'm not prepared for it at all; bought a Barron's prep book, but haven't opened it yet.
My college only counts Macroecon if I get a 4 or a 5 on it, but it would be a miracle if I can read through the entire prep book AND learn the material by this Thursday.</p>

<p>So... I would like to cancel my exam before taking it. Does anyone know the procedure for this?</p>

<p>How many days ahead do you need to cancel an AP test? Am I stuck with taking it at this point?</p>