The first idea that Garrett Hardin used in his essay is the idea of survival. He argues that people will do anything in order to ensure their survival even resorting to unethical decisions. The next idea is the idea of choosing not to help the poor because it will only diminish the chances of survival. The poor need more resources, multiply fast and have a high-risk factor according to Hardin.
Well if she cheats she will probably get caught on some sort of CCTV (camera) if not by some staff. If she doesn't cheer them she will fail and everyone will go 'boo hoo' ( if u get what mean) The main issue is that she will force herself to cheat and waste time getting her cheat notes ready shares she can revise.
It could be both, maybe they hurt themselves because they want to call some attention or it could also be their way to feel better with themselves