It eventually degrades into game theory where you're trying to predict how your classmates are going to answer the questions. If you play it too safe and only answer questions you are 100% confident in, you might not get a lot of marks. But you won't lose any marks either. If you friends play it more dangerously and answer questions they are 70% confident in, they could either get all those wrong (boosting your mark) or get them all right (lowering your mark).

On the one hand it's fascating. Yet on the other, it's absolutely terrifying.