If the school principal is strong, motivated and a good manager who clearly outlines expectations for staff and students, then the school tends to make progress.
These overall scores are good as a general overview for schools, and if they don't meet their goals, they know they have to work very hard this year. Hopefully schools know where their weaknesses are and have already started doing some things to help them score higher next year.
We don't want individual children to be singled out, whether their scores are good or bad.