Achievement tests in reading, mathematics, and science show higher average
scores for private school students. In addition, private schools tend to
require more years of core academic subjects for high school graduation
than do public schools, with some variation across school types. Graduates
of private high schools have on average completed more advanced courses
than public school graduates in science, mathematics, and foreign language.
Finally, students who had attended private school in 8th grade were twice as
likely as those who had attended public school to have completed a bachelor’s
or higher degree by their mid-20s, and far less likely to have had no
postsecondary education.