I think my son's scores helped with the decision to accelerate him.

His Stanford-Binet composite score was a 153, and last week the Highly Gifted program administered the KTEA-II on him so we can submit it along with our application to the Davidson YS program, and the achievement results were:

READING
Raw score: 53
Standard score: 159
Percentile rank: >99.9
Descriptive category: Upper Extreme
Grade equivalent: 8.2

MATH
Raw score: 31
Standard score: 135
Percentile rank: 99
Descriptive category: Upper Extreme
Grade equivalent: 3.5

WRITING
Raw score: 50
Standard score: 118
Percentile rank: 88
Descriptive category: Average
Grade equivalent: 2.9

Also, a lot of positive feedback from the GATE teacher helped. My son had trouble finishing up work in his 1st grade class, but not in GATE. Also, he was able to handle himself pretty well with the older kids in GATE, and his GATE teacher saw no problem in accelerating him up a grade.