Originally Posted by ConnectingDots
If by underachievement you mean not getting good grades, that can be strongly influenced by the curriculum being so easy for him that it is not worth (in his mind) the effort, voila, bad grades.

Quote
However, if he's not understanding the material, that's a different situation and might indeed warrant further assessment.

FWIW, there can be other reasons for underachievement, that might be reflected in low achievement test scores as well as low PS score on the WISC.

polarbear