So, I am going to add in his CogAT scores from 6th grade taken 1/2013. I am not one to really trust in the CogAT (it horribly missed DS9) but I don't know if it may provide further insight with DS13.

Abilities SAS Stanine %Rank #Items #Att #Correct
Verbal 111 6 75 65 65 53
Quantitative 121 8 91 60 60 54
Nonverbal 119 7 88 65 63 58
Composite 119 7 88

Those are listed under his national age scores, the national grade scores:
Ability Stanine %Rank
Verbal 6 71
Quantitative 8 90
Nonverbal 7 88