My son (just turned 8) has done it twice now- he missed the qualification by one point in both the first time, cleared it by 10 pts in both the second time.
Are you doing it at a Prometric place? One thing that really weirded my son out the first time is that there are tons of adults in there taking tests for other things. I would have warned him about that in advance had I known. They were all staring at him and whispering. One of them left to use the restroom and walked by the waiting room. He thought my son was there taking the MCAT like all the other people :-)
There is a decent amount of background noise while people are typing essays and thinking etc. If your son is one who gets distracted by random noise, take some earplugs. They did have headphones but they were not kid-sized!
