Arched exam

How did people get 50/50 in the arched exam?

I know by studying you can get a pretty good score. But it feels like a lot of them are cheating in someway? Cause think about it, a few years ago the highest scorer didn't use to get the highest score possible. But now multiple people get 100/100, 50/50. How is it possible? Or better what materials are they using to study?