school stages in uk

Key Stage 0 (KS0)
Age 7–11. Y3–6. 1st–4th form juniors 11 plus (generally only for Grammar School entry)

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References:

http://www.goodschoolsguide.co.uk/international/curricula-and-exams/uk-overview
http://www.gov.uk/schools-admissions/school-starting-age