grammar school
The state constitution refers to "a basic system of free quality public elementary and secondary schools."
People in low-income democracies have a 40 percent greater chance of attending secondary school than their counterparts in low-income autocracies.
Students with parents who are involved in their education are more likely to complete secondary school.

SMART Vocabulary: related words and phrases

Types of school
academy
alma mater
alternative school
business school
centre of excellence
charter school
coeducational
conservatory
elementary school
grade school
grant-maintained school
prep school
preparatory school
private
reform school
reformatory
selective
seminary
senior high school
special school

secondary school | American Dictionary

secondary school
noun[ C ]
us/ˈsek·ənˌder·i ˌskul/
a high school