招办 is the everyday abbreviation of
招生办公室 (zhāoshēng bàngōngshì, recruitment / admissions office). It can refer to a school's office or to provincial-level
省招办 that handles college entrance results.
办 here is the abbreviated form of
办公室 (office), as in
国办 (State Council General Office),
教务办 (academic affairs office).
