78 is really low - I think that is moving into the single digit percentile category. If that measure is accurate, then it should be reflected in his ability to complete academic work in a timely manner as well as everyday activities. While it is reassuring that the tester thinks that he simply wasn't trying to go as fast as he could, I would check by timing how quickly he completes cognitive and other tasks. As he gets older, a low processing speed will cause increasing difficulties with academics in a school setting even with accommodations.