The reason the report has 13 subtest as opposed to 10, like many here post, is that he was given 3 optional subtests (Information, Picture Completion and Arithmetic). These optional subtests do not factor into the Full Scale score but they provide additional information. Many psychologists administer only the 10 required subtests in order to save time (after all, most neuropsychological testing also includes academic achievement tests as well).
It really bothers me that schools make such inane, unsubstantiated judgments about parenting from cognitive scores. "Comprehension" questions require open-ended verbal reasoning. Sample "Comprehension" questions are:
--Why should one keep away from bad company?
--Why are streets numbered in order?
--Why do we keep money in a bank?
--Why do we have laws?
--What does "a stitch in time saves nine" mean?
So your DS might just not make his reasoning completely explicit or provide passable but not perfect answers. Perhaps although his reasoning is perfectly lucid, he doesn't like to elaborate and is reserved. Wrong parenting is the last explanation that should be explored and don't let what the psychologist said make you feel guilty. Not all "professionals" are of equal quality; many are mediocre. If you can, I would ask the testing psychologist, what was wrong with his "Comprehension" responses: superficial and not reasoned out? reasoned out but not completely explicit? good response but spoiled at the end because goes on tangent? freezes and says he doesn't know and is afraid he won't be able to reason it out on the spot? etc. Knowing the specifics will give you a better idea of the areas to work on.
Given how strong he is across the board and that Letter-Number Sequencing is high, I don't think he has any neurological/LD issues that lowered Digit Span and Picture Completion. Digit Span was probably lower because it is a rote, not very intellectually demanding task and so he didn't put too much effort into it.
As for Picture Completion, fortunately it didn't factor into the full-scale. In this subtest, a child is shown a picture of a scene and asked "what's missing?". For example, a child may be shown a picture of a volleyball game where a net is missing and he has to identify that "what's missing is the net". Or he may be shown a clock which only has a long hand and no short hand and he has to say that "what's missing is the short hand". Poor environmental awareness, poor attention to detail and a degree of cognitive inflexibility may all cause a lower score. I took an adult version of this IQ test at age 20, and did absolutely atrociously on "Picture Completion", much lower than your DS--it was my lowest subtest. Unfortunately for me, it is a required subtest on WAIS III and factors into all composites.
