The scores should be age normed. The overall score would be 4th grade. Just a word of caution with the school - his calculation is impressive but the school might think he is simply hot-housed. Focus on Broad Math score which is overall math score. Applied problems really shows a kids math reasoning skills and while your son's is high, it is not greater than 99.9% If the school knows this, they might give you push back on more than one year acceleration. Again, this is just a note of caution on how to approach the school, not in any way intended to diminish your son's scores.
