Abbreviation of 公立学校. Refers to a publicly funded school (elementary through high school) in Japan.
See also: 公立学校
The public schools in this area have a good reputation.
I'm undecided whether to go to a public school or a private school.
Abbreviation for 'private school', often contrasted with 公立校.
Abbreviation of 公立学校 (こうりつがっこう), itself a compound of 公立 (publicly established) and 学校 (school).