Hmmm. My son took the SB5 in feb at 5.9 with a fsiq 132, which was too low for the program I wanted him in. I had him re-tested (new tester) in April with the WISC and he got a fsiq of 155. A friend of mine whose son is HG/PG had a similar experience on the SB5 using the same tester we used. So, I am not sure if I am doubting the SB5 or our first tester ...so I am also not sure if this post is any help at all to you, but here it is. My son is pretty evenly developed verbal & non-verbal.