<p>IIRC, the directions for the comp exam stated that the only drawback for doing poorly or not doing it at all were that you would have to take the class (don’t quote me on that, I’m not positive). But really even if that wasn’t explicitly stated, it takes something really serious to get rescinded, especially during the summer, such as discovering you lied on your application, plagiarised, committed a felony, etc. As for reasons people don’t take the test, some people figure they aren’t good writers and will end up taking the class anyway, so why bother taking the test? Also some people forget, or are just lazy, etc.</p>