The NNAT3 only has one score, so what you have is pretty much all the data there is to see (excellent score, btw). It's a nonverbal reasoning test that is supposed to be relatively culture-fair, which is why your district uses it (there were lawsuits some time ago regarding cultural and linguistic bias in this type of testing).

Congratulations to your DC on placement in the HGA program! Hope the school year is going well.