Well it was in the 1st grade. Child IQ tests assuming it is one often use a different scale than what most people recognize as IQ. 147 on a child's scale is smart, but the truly brilliant (150-170 adult IQ) commonly score either higher than the test can define or close to it as children (about 200 iirc). I'd assume he had a 147 child IQ, but has a 120-130 adult one. If someone had a 147 adult IQ at 6 than he's one of the smartest people to have ever lived, like 1 in a billion intelligence. If he's not misleading people, than that's really tragic he's wasted that much potential.