From what I read, you are supposed to wait a year between tests for the WISC-IV. I think neuropsychologist I spoke to was not well-informed (another reason to make me hesitate). I don't know if the results are invalid if you don't wait that long or if it is just a recommendation.
I checked the dates, and my DS's potential testing would be 11 months and 1 week after the first test, so I guess that would be OK. I'm more interested in the results of the EF and attention testing, and the behaviour rating for depression/anxiety.
We have done the Conners' behaviour scale twice now (at 4 and 10, with a different tester and a different teacher each time) and were told both times that there was no indication of ADHD (but he rated high in "oppositional" behaviour both times).
It seems like there is no perfect tool to understand what is going on with kids like this.
