U.S. News and World Report enlisted the help of social science research firm RTI International to compile its rankings. They measured schools using four key metrics:
- Math and reading proficiency for all students
- Testing proficiency for disadvantaged students
- Graduation rates
- College readiness via Advanced Placement or International Baccalaureate test data.
Greenwich High School boasts a student-to-teacher ratio of 13:1 and 62 percent of the student body participates in AP exams.
There were 14 other high schools in Fairfield County that made the Connecticut List:
- Weston High School (No. 4)
- Ridgefield High School (No. 5)
- Wilton High School (No. 7)
- Darien High School (No. 11)
- Staples High School (Westport) (No. 14)
- Joel Barlow High School (Redding) (No. 15)
- Fairfield Ludlowe High School (No. 16)
- New Canaan High School (No. 17)
- Fairfield Warde High School (No. 18)
- Brookfield High School (No. 25)
- The Academy of Information Technology (Stamford) (No. 28)
- Masuk High School (Monroe) (No. 34)
- Westhill High School (Stamford) (No. 35)
- Brien McMahon High School (Norwalk)(No. 42)
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