IIRC, the study guides are about 5th grade level.
For me, I'd say anyone with a 4yo reading them would be safe in assuming giftedness. But I say that from my perspective as mom of the kid who didn't read before kindergarten (so nearly 5.5), despite being desperate to learn and despite my efforts to teach her and despite her preschool teachers' opinions that she'd be reading by the end of preschool.
My concern would not be "is he gifted," but "is he gifted in such a way that he's assured of a 130 on the school's test."
FWIW, I'd guess my DD would have no trouble getting the 130 required for admission to the gifted private school near us. But it would still make me nervous to be betting on that 3 years out, you know?
