If there are significant numbers - entire classrooms of kids, not just one or two kids - there may be others who are advanced in math. Our district claims (not sure I believe it) that almost a third of 4th graders score 94th percentile or higher on the Spring MAP math test (and that score would translate to a 75th percentile score for a 6th grader). I do think that there are significant numbers of kids who are two years advanced in math, at least in the "good districts".
Not sure if this is what you meant, but be careful about interpreting equivalent percentile scores. They mean, "a 6th grader getting this score on this test would be at the 75th percentile for that age group." They don't mean that "a 4th grader getting this score is two years advanced in math." They just mean "a fourth grader getting this score on this test is really good at the stuff tested here." Out-of-level testing is required to make the advanced-or-not determination.
Now that I think about it, I'm not sure why they even include those equivalent percentile scores. They seem to sow confusion.
