The 2027 Best All-Girls High Schools ranking is based on rigorous analysis of key statistics and millions of reviews from students and parents. Ranking factors include the quality of colleges that students consider, student-teacher ratio, private school ratings, and more. SAT/ACT scores have been removed from this year's rankings to reflect a general de-emphasis on test scores in the college admissions process. Data sourced from the U.S. Department of Education, Niche users, and the schools directly.