In the schools typically they view anything with a 16 pt. difference as significant. The manual of the WISC-IV has tables based on child's age and ratio of that split. And typically 19 to 21 points starts to get to statistically significant.
Clearly there is a big split of the PRI being so much higher than VCI, WM, & PS. This suggests your son has great PRI strengths. Since the other three are all within the same range it would be hard to take a leap from those scores alone to suggest a problem. If you suspect ADD definitely consider additional testing--schools can do ADD/ADHD screenings, some pediatricians will do them, neuropsychologists & psychologists can also be great help. In order to determine dyslexia you would need a complete achievement battery and some additional specific reading assessments. Schools can do these exams--a full individual educational evaluation. Or look for dyslexia specialists or reading specialists in your community.
