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At 16 pupils take a national exam called "GCSE" (General Certificate of Secondary Education) and then they can leave school if they wish. This is the end of compulsory education.
Some 16-year-olds continue their studies in the sixth form at school or at a sixth form college. The sixth form prepares pupils for a national exam called "A" level (advanced level) at 18. You need "A" level to enter a university. Other 16-year-olds choose to go to a college of further education to study for more practical (vocational) diplomas relating to the world of work, such as hairdressing, typing or mechanics.
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Why do you need advanced level exam?
You need this exam to go to work.
You need this exam to continue your education at school.
You need this exam to continue your education at college.
You need this exam to enter a university.