在校

在校	zài xiào	(attributive) to be enrolled in a school (or university etc)
在	zài	to exist; to be alive / (of sb or sth) to be (located) at / (used before a verb to indicate an action in progress)
校	jiào	to check; to collate; to proofread
校	xiào	(bound form) school; college / (bound form) (military) field officer