DDs school (independent) have changed the way they assess pupil performance by comparing them against the other pupils in their set (which is their class except for maths) They have an attainment and an effort grade:Attainment:EX - Consistently well above the rest of the set (top 5%)AA - Regularly well above the rest of the set (next 20%)AV - Average level of attainment across the group (50% of se