In case anyone thought these levels meant anything standardised... DS just got awarded ASA level 5 from one school and level 7 from another. In the same week! 
For his age neither is particularly good so not a stealth brag or anything. It just amused me. And I thought it might reassure anyone who's worrying about their DC not moving up - just move them to a different teacher and they could go up 2 levels in a shot.