Mill Hill offers a broad curriculum which aims to prepare pupils for entry into top universities and leading Higher Education institutions for other disciplines in the United Kingdom and beyond.

The first year at Mill Hill is the Fourth Form (Year 9) which provides a foundation curriculum in over fifteen subjects. GCSE courses start formally in the Remove (Year 10); pupils sit typically nine or ten subjects at GCSE. In the Sixth Form, pupils select four subjects at AS Level. The majority of pupils then study three subjects in the Upper Sixth Form.