BlueSkye1962, adding a bit to what Mark wrote:

"The WAIS-II Wechsler Adult Intelligence Scale-II measures processing speed and the difference intelligences, verbal, math, reasoning, etc."

It is very common for people to perform at different levels in the different parts of WAIS. For example, one of my nephews, who has no neurological issues, is in the gifted range for verbal intelligence and is in the high-normal range for number skills.

If something similar applies to you please don't panic about it; it may well have nothing whatsoever to do with your TBI/PCS.