If someone attends the "Lower Sixth" at an English grammar school, when will s/he have his/her A-levels? As far as I know, the term "Lower Sixth" refers to students in year 11, the term "Upper Sixth" to students in year 12, i.e. the year they take their A-levels. Could anyone verify this please? Thank you!
No. Year 11, the fifth year of secondary education in most counties, is when students take their GCSE examinations.

In those schools that still use the older terms, Year 12 is called the Lower Sixth and Year 13 the Upper Sixth; that's the year in which students take their A levels.
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