common school

a public school usually including both primary and secondary grades but sometimes primary grades alone.

Origin of common school

An Americanism dating back to 1650–60

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

A common-school law providing universal public education free from all religious bias, compulsory up to fourteen years of age.
Socialism and Democracy in Europe|Samuel P. Orth
But are you ready to maintain that there is no element of excess infused into our common-school system?
The Atlantic Monthly, Volume 16, No. 96, October 1865|Various
But it does not follow that these grave evils are to be laid to the communism of the New England common-school system.
Belford's Magazine, Vol 2, December 1888|Various
This, we maintain, is what our common-school system as now organized and controlled is doing.
Belford's Magazine, Vol 2, December 1888|Various

None of the total amount seems to go for common-school education, as it is understood in the United States.
Industrial Cuba|Robert P. Porter