my predictions
>gen 0
everyone graduates except Azki and Sora
>gen 1
everyone graduates except mel and akirose
>gen 2
either everyone graduates except aqua or none of them graduate except subaru
>gen 3
everyone graduates except for Marine & Rushia
>gen 4
None of them graduate except maybe Watame
>gen 5
if nene is able to pull through, none of them graduate
>gen 6
None of them graduate

>EN myth
they all graduate except for ina and kiara
>EN council
they all graduate except for baelz and/or fauna

>ID
no one graduates except for reine