The 2015 norms are lower so 213 is 96 percentile for 3rd grade. Your DS6 is obviously strong in math. However, there are normally huge jumps as well as large variations in scores in the early grades plus many schools switch to the 2-5 MAP by 2nd grade, so the K-2 test for a high achieving 1st grader doesn't provide the best indication of his "grade level". District level end-of-year assessments would probably give you a clearer indication of your DS6's grade level as compare to actual students in his district.
