I can't remember if you said whether or not he was tested in any other areas. Clearly he is very bright, but there is a lot of scatter from one index score to the next and the WMI and PSI are relative weaknesses that could point to attention difficulties. But, ADHD and or executive functioning problems cannot be diagnosed by the WISC alone.
If he is struggling with organization and attention, it may be wise to get more information. It could be ADHD, NVLD or EF issues (or other difficulties), but without more data, you really can't rule anything in or out. Certainly as the pace and volume of school work increases as you head to Middle School, he might struggle dispute excellent thinking ability. It would be good if you had more information and if needed could intervene now with specialized instruction in the areas of meta-cognition, medication or other approaches.
