Greenhead college in Huddersfield, West Yorkshire, is one of the top two highest achieving sixth-form colleges in the country in terms of A-level pass rates.
Inspectors judged that the provision in nine of the 10 curriculum areas as outstanding, and good in the remaining area. It described leadership and management as outstanding.
The report said: "There is a very clear strategic direction underpinning all the college's work that puts students and their achievements first.
"The college is nationally renowned for its value-added system. This tracks students' progress taking account of their qualifications on joining the college. The value-added system is used rigorously to analyse results and highlight areas for improvement."