Sixth form - Wikipedia
https://en.wikipedia.org/wiki/Sixth_form
In the education systems of England, Northern Ireland, Wales, and some other Commonwealth countries, sixth form represents the 2 years of post-GCSE academic education, where students prepare for their A-level examinations. In England, Wales, and Northern Ireland, the term Key Stage 5 has the same meaning. It only refers to post-16 academic education and not to vocational education.
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