Key Stage 3
http://en.wikipedia.org/wiki/Key_Stage_3
Key Stage 3 (commonly abbreviated as KS3) is the legal term for the three years of schooling in maintained schools in England and Wales normally known as Year 7, Year 8 and Year 9, when pupils are aged between 11 and 14. In Northern Ireland the term also refers to the first three years of secondary education, although these are known as Year 8, Year 9 and Year 10.
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