Thanks, that definitely made it very simple to understand.
Still not 100% convinced on the applicability under various conditions^[and if I want to be, perhaps I should stop being lazy and go read the law], but I understand it from the Government POV. Kinda similar to the country-country hostage exchange we see in stories, which makes sure the other would have a reason not to renege on some agreement, even if they don't have a reason for mutual trust.
That seems like the worst way of making an exam.
In case the cheat sheet were not there, it would at least be testing something (i.e. how many formulae you memorised), albeit useless.
When you let students have a cheat sheet, it is supposed to be obvious that this will be a HOTS (higher order thinking skills) test. Well, maybe for teachers lacking said HOTS, it was not obvious.