what are the ages for school years uk

Your child must start full-time education once they reach compulsory school age. This is on 31 December, 31 March or 31 August following their fifth birthday – whichever comes first. If your child’s fifth birthday is on one of those dates then they reach compulsory school age on that date.
If you do not think your child is ready to start school by then, they can start part-way through the year or part time – as long as they are in full-time education by the time they reach ‘compulsory school age’.

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Age 5–7. Y1–2. 1st–2nd form infants
Age 16–18. Y12–13. Sixth form secondary, FE college A-Levels, AS-Levels, NVQs, Diplomas

References:

http://www.goodschoolsguide.co.uk/choosing-a-school/scottish-education-system
http://prosperoteaching.com/from-overseas/uk-key-stages-by-age-year/
http://prosperoteaching.com/from-overseas/uk-key-stages-by-age-year/