I would definitely get a detailed breakdown... my tester even provided me with the raw scores when I asked him.

My son (also in first grade) is similarly strong-willed and school has been a disaster for us too. From what I can tell, at this point, the teacher has given up on him and lets him do his own thing (read in the corner)... she has too many kids to manage (30)-- your son's teacher sounds similarly overwhelmed.

Don't have any advice, really, but I can commiserate.