For a less confrontational protest song there is the UK's current eurovision entry "Children of the Universe" by Molly. "You know what we want and we've gotta get it now" is about has angry as it gets. If you needed mood music for a clasic non-violent student protest then this would do the job.
Full lyrics http://www.eurovision.tv/event/lyrics?e ... song=31363
Official Video
Full lyrics http://www.eurovision.tv/event/lyrics?e ... song=31363
Official Video