what are the stages of education in uk

Key Stage 1 (KS1)
The UK Key Stages are targets to be achieved in various subject areas as set out in the UK National Curriculum.

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References:

http://www.goodschoolsguide.co.uk/choosing-a-school/scottish-education-system
http://www.goodschoolsguide.co.uk/choosing-a-school/independent-schools/uk-independent-schools-explained