Thanks to everyone who took the time to read and post.
We could debate many points, but the fact remains: the boys were not instructed to the second requirement. I was present at each session, 50 minutes each day for 5 days, and it was open shoot each time.
This was why I asked the question about the requirements. I didn't have any concern about accuracy, as long as he hit the paper, it was fine with both of us (and he did fairly well at that).
I grew up in a shooting family and keep firearms secured at home. I'm comfortable with introducing my son to the requirements, and then having him demonstrate what he's learned to an instructor the next time we're at camp, now that I know what age-appropriate requirements are.
For the record, my son is Autistic with Asperger's, and there are many times when "do your best" have been just that. But as a father, "do your best" will simply not cut it when it comes to handling firearms, ever-ever. Even semi-harmful ones.