@Askorti
Again, they could be doing anything else ... say, like organizing their stuff, tucking their chair to a confortable position, mentally reviewing the studied subjects, preparing their clock ... stuff that would materially help in the exam. Wishing evil onto others does not.
And, as I hinted above ( should had been more clear ), even in a highly competitive enviroment ( and , as someone that aimed ( and got ) to enter a uni course that had literally a vacancy for a million pop, I actually know the situation of the manga better than I wanted to ), your efforts are always more useful in bettering your position even in minute ways than on doing damage to others ... especially if that damage is mostly imaginary.