<p>Can't answer your question about CC, but...</p>
<p>The AP test scores trasnfers into credit as shown in the above site. They don't count towards GE, but can count towards major (if that's what it says, like for example, Math) You cannot retake any of the classes you already have credit for. All the units received can count towards the 180 units you need to graduate (excluding upper div units).</p>
<p>And you don't receive a grade for the course. It just shows that you completed the equivalent (if there is one) course and gives you the units.</p>