primary school levels explained

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Information about primary school progress measures
It sets out how the results from the key stage 1 and key stage 2 national curriculum assessments are used to calculate primary school progress measures. It also explains what these progress measures mean.

References:

http://www.gov.uk/government/publications/primary-school-progress-measures-information-for-schools-and-parents
http://www.gov.uk/know-when-you-can-leave-school