Graduating early? 

Nope no one is graduating early, they are just changing sections. Like from B moving up to an A. 

And only those will be bumped up who encountered and survived the Vile. So that would be all of our characters. If someone was no where near the area than I suppose he can try and help out. =p

And yea it would change the do-it-multiple times for our characters. As the jungle is only for rank A capable Asylums. However it is capable for them to have done it multiple times.

Also it is possible for a Rank A to be partnered with a Rank B.