KeyStage2 test markers, who are practising or retired teachers, receive thorough training and undergo a number of quality checks through the marking process.
Mr Read, an independent education advisor, also said Sherwood was one of the bottom nine schools in Kent in terms of repeated poor KeyStage2 results over four years, and was being taken over by an as-yet-unnamed academy group.
They will also allow readers to find out how schools are helping pupils to progress, with a value-added measure that indicates how pupils have improved between the end of KeyStage 1 (infants) and the end of KeyStage2 (juniors).