sixth form

noun2

1. •
   The final two years of secondary education, during which students of about 16 to 18 years of age prepare for their A-level examinations or equivalent qualifications.

   • Nathaniel: Maister, there is nobody to teach in the sixth form. Maister: What a thing is this? N: He is sick in bed. M: How do you know? N: One of the scholars in his house told me so. — 1653
2. •
   a sixth form college.