Since your ds is very young and since the WPPSI-4 is very new, and as MumOfThree noted, said to be producing lower results than previous WPPSI versions, I wouldn't overthink the actual numerical values he received on the test, other than to note what is possibly meaningful: the scores on the subtests he completed are all very consistently within the same range.
I'd ask the tester for as much info as possible re what happened with the matrix reasoning subtest: was it one of the first or last subtests given? Was your ds distracted, or was he focused and trying hard to get the answers?
I'd also try to consider what the matrix test task involves in terms of thinking, and think through in my own mind - does it relate to anything that might be frustrating your ds at school or with academic work? It's possible that this one subtest just happened to be a subtest that occurred when your ds was tired of testing or something he just didn't want to do and he's 4 so he didn't do it - or it's possible that the large discrepancy in his performance on this one subtest means *something*. Discrepancies like this aren't unusual in children who are twice exceptional, and behavior issues at school can be another sign of an unrecognized challenge.
I would most likely talk to her a bit about what she sees that she thinks is an educational mismatch. Is there any pattern or consistency to when her ds has challenges at school? Has he had any type of behavioral challenges at home or is it limited to school? It's easy (I'm speaking as a parent who's btdt with my own 2e kids) when our kids are young to come up with our own ideas about what's up when they are having trouble based on what we *know* of our children. I knew my EG ds was very bright, so when he had trouble at school I was looking at it through that slant and finding reasons for his behavior challenges that were related to lack of academic challenge etc. The real issue though wasn't how bright he was, but how challenged he was with his disability - the thing was, I didn't know anything about that disability, had never heard of it before, and had no known reason to look for it - so I didn't see it. *IF* your friend's ds is struggling with what seems like outside-the-norm behavioral issues at school, I'd consider testing privately with a neuropsych or other professional who will do behavioral surveys and achievement testing as well as additional tests to tease out why a subtest like matrix reasoning was particularly difficult.
And I'll also add - he's 4. If you hadn't mentioned he was having behavioral issues at school, I would probably have left my reply at just that. He's 4
Best wishes,
polarbear
ps - I wanted to add one more thing that is outside of the testing question - it sounds like your friend has considered the preschool environment from an academic standpoint, but has she considered anything else about the current school environment (staff, other children, schedule etc)? My older dd had some relatively severe behavioral challenges at her first preschool (or so we were told). It didn't make sense in light of what we knew of her personality at home. We eventually pulled her out of the preschool and sent her to another, where suddenly *all* of the challenging behaviors stopped. We ultimately found out the behaviors that we kept getting all the reports about were due in large part to actions of the preschool staff that we had no idea were happening.
