uk school ages

Children born between 1 April and 31 August can start the September after they turn 5.
Most children start school full-time in the September after they turn 4.

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Year 7 (Secondary)
Republic of Ireland Class Groups

The UK Key Stages are targets to be achieved in various subject areas as set out in the UK National Curriculum.
Age 16–18. Y12–13. Sixth form secondary, FE college A-Levels, AS-Levels, NVQs, Diplomas

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References:

http://www.goodschoolsguide.co.uk/international/curricula-and-exams/uk-overview
http://www.rathdownschool.ie/Class-Ages/
http://prosperoteaching.com/from-overseas/uk-key-stages-by-age-year/
http://schoolreadinglist.co.uk/
http://www.goodschoolsguide.co.uk/choosing-a-school/the-british-system