sixth-form college
US /ˈsɪksθ.fɔːrm ˌkɑː.lɪdʒ/
UK /ˈsɪksθ.fɔːrm ˌkɑː.lɪdʒ/

1.
a college in the UK for students aged 16–18, where they usually study for A levels
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After finishing secondary school, she enrolled in a sixth-form college to prepare for university.
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Many students choose a sixth-form college for its specialized subject offerings.