From the Facebook page, not posted by Ash but seems to explain the confusion.
"Yeah, I was confused... "Academic", "Firearms", "Athletic", others, I was flipping through the book frantically trying to figure out what that meant. Then I realized it was a CATEGORY of skills, not the skill itself.
Way better idea, though slightly confusingly presented."
Hope this helps
There is also a FAQ posted ,does not cover this question, but does cover some queries.