Here are the
AAMC acceptance protocols.
By
April 15, you have to narrow your acceptances down to
three (you can remain on as many WL as you want).
By
April 30, you have to narrow down your acceptances to
one school and “plan to enroll” there.
You can still hold WL positions after April 30.
The “commit to enroll” (CTE) is more binding and removes you from any other waitlist, but this deadline is later and depends on schools, with most being in June.
If you have any other A’s, you have to “plan to enroll” at one of them by April 30 or else you risk it getting rescinded because after April 30 schools start to see more detailed information about who is holding multiple acceptances, who hasn’t selected their school, etc. If you get off the WL at another school after April 30, you have to notify your PTE school as soon as possible so they can pull from their WL as well.