there are official documents that list navy rollable and graded events. I will try to pull the YouTube video that had them. She has all of her sources listed. Posted 4 months ago.
my understanding is you need to be reasonably close. If you are borderline, they will let you continue with the class, but will have the extra PT, which doesn’t at all sound fun. Now obviously “borderline” is very much up for interpretation, but the explanations that I have seen, people that get rolled from this event either got injured, or were no where close to being able to complete it.