suffix, counter
Attaches to school names or types to form the name of a school, or used as a counter for schools. Common in compounds like 小学校, 中学校, 高等学校, and in counting expressions like 一校.
この町には小学校が三校あります。
There are three elementary schools in this town.
彼は都内の私立校に通っている。
He attends a private school in Tokyo.
noun, counter
Refers to the act of proofreading or a proof sheet. As a counter, it counts proofs or proofreading rounds (e.g., 初校, 再校). Often used in publishing contexts.
原稿の初校が上がってきた。
The first proof of the manuscript has come in.
校正者は三校までチェックする。
The proofreader checks up to the third proof.