The first step is to reset the Chromecast using the physical button on the device:
How to factory reset your Chromecast - Chromecast Help
However, you mentioned it will be used at a college. If the Wifi network there requires you to login first or register devices to access the internet, you may experience issues connecting Chromecast to Wifi as it does not support those kinds of Wifi networks. There are potential workarounds, but just wanted to let you know.
