Another thought I had on this topic...
I know of 2 boys who were tested early and scored in the NG range. They enjoyed the pull out gifted program at their elementary school for several years, but then around 4th grade stopped doing classwork and started failing (or maybe getting Ds). One mom was beside herself because she said all he wants to do is read and she didn't want him to be penalized by taking his books away. I suggested she have him re-tested because it sounded like he was bored stiff. His retest had a 15 pt jump in IQ! Enough to qualify for self-contained program. The exact same thing happened to another friend, though her son only had a couple months in the PEGS class before going to middle school.
Both boys tested initially at about 6 and retested at about age 10.
