I have a 4th grader in the same range - no acceleration, just G&T program. She is bored in math this year and says it is very easy.
Is he still taking the 2-5 test, or have they moved him to the 6+? DD is still taking the 2-5 test, because her school will not move them until they are in 6th grade, no matter what the score is. She felt like the last time she took the test, "it felt like the test was running out of questions," which sounds odd, but some of the literature about the test would suggest that students in this score range should be moved to the 6+ test.
