plagio,
Some schools use CogAT as screening test for giftedness. If the kid gets 95 percentile or higher, would be labeled gifted.
But it is more meaningful if it is at least above level testing. 2nd grader can not take EXPLORE from Duke but he may be able to take John Hopkins CTY SCAT exam.
http://cty.jhu.edu/talent/But first, talk to the school and see if they can do accomodation. When you say that the percentile is higher for grade, you mean that he is old for his grade? Then, consider skipping a grade.
