In the education systems of England, Northern Ireland, Wales and some other Commonwealth countries, sixth form (sometimes referred to as Key Stage 5) represents the final 1-3 years of secondary education (high school), where students (typically between 16 and 18 years of age) prepare for their A-level (or equivalent) examinations.The term sixth form describes the school years numbered 12 and 13, which are called the Lower Sixth (L6) and Upper Sixth (U6) by many schools
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