In the new version of OS X, Yosemite, AirDrop helps you quickly transfer files between your Mac and nearby Mac computers or iOS devices using Wi-Fi. The best part, especially in the school setting, is that your devices do not need to be on the same Wi-Fi network for AirDrop to work as they will create their own directly connected network to allow for file sharing.
http://instructionaltechtalk.com/using-airdrop-classroom/