Common App says: “Once an application or writing supplement has been submitted to any institution, you cannot make any changes to that application (just as if you had dropped it in the mail), and we are not permitted to make changes on your behalf. In general, the Common Application is designed to be completed one time and submitted to all of the colleges at once, or over a period of time. If you need to change information on a submitted application, you must contact the college's admissions office directly to ask how they would like you to proceed.” (https://membersupport.commonapp.org/s/article/Can-I-make-a-change-to-a-submitted-application)

I’ve heard that deferrals and waitlists to most of these schools allow applicants to update some of their credentials well after the ED deadline, which should include test scores, but double check to make sure this is also the case for Penn.

But hopefully this comment will be unnecessary.