Re: Less Educated
In real life, someone without a third grade an higher education would lack several skills we take as commonplace: writing in cursive, multiplication, adding three-digit numbers, social studies (from understanding basic geography to history), science, and probably socialization, depending upon what the "realm of shadows" was like. If your character was discarded into the realm and left alone, then a closer to reality application would be the equivalent of children raised by dogs, giving your character at best, the eduction/mentality of an 8 or 9 year old, but more likely he would have degenerated into basic, primal thinking. (Your character has had maybe four years of education followed by six years of no education.)
In the end, it would depend upon what happened to the character in the shadow realm and how far you're willing to go for this niche.