Dottie,
Oh no, he's not off to high school yet, not even close.
While age equivalents went into double digits, most all the grade equivalents were 3rd and 4th grade. She did all 9 subtests but the only one with age standard scores are the ones you listed. I'm not sure how you get an age 13:4 but a grade of 4:6 in the same subtest? She said she had to massage the numbers to fit his age and I think used a higher grade as his own grade in those instances -which she said may have negated the norms to some degree. She was really only concerned with whether or not he was ready for second grade placement so I think gleaning information beyond that was not that important to her.

I think I will take your advice and "squeeze her" for some more info. She remarked after each test that his scores are the highest she has ever seen (not all that comforting), and she didn't know the test ceiling was 160, so not sure what happened in there. The WIAT II took close to 4 hours!