<p>As someone said before, it depends on how far the person’s average grade has fallen. Usually, if something looks fishy, colleges will send warning/check-in letters before they outright rescind (colleges don’t want to rescind unless it’s really bad). Unless your classmate is truly failing or getting D’s/low C’s when he should be getting A’s, unfortunately, chances are he won’t get rescinded. </p>
<p>I’m basing this off my friend’s senior slump and subsequent research on rescind policies (mostly on MIT), in case you were wondering. I’m guessing Penn would have something similar.</p>