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GCSE is the qualification taken by 15 and 16 year olds to mark their graduation from the Key Stage 4 phase of secondary education in England, Northern Ireland and Wales.

Key Stage 3 is the first three years of secondary school education in England and Wales, for pupils aged 11 to 14.

Key Stage 2 is a phase of primary education for pupils aged 7 to 11 in England and Wales.

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Key Stage 1 is a phase of primary education for pupils aged 5 to 7 in England.

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