What are the parameters for acting upon the rule: "Necessities permit the forbidden," and does cheating on school exams fall under this rule if it is out of fear of failing after reviewing the material?

The origin of the rule "Necessities permit the forbidden" is the Almighty's saying: (But if one is forced by necessity, neither desiring it nor transgressing, then indeed your Lord is Forgiving and Merciful). The criterion for necessity is that the failure to commit the forbidden act would lead to destruction or severe harm to one of the five necessities (religion, self, intellect, wealth, honor). In such a case, it becomes permissible to commit the forbidden. This occurs when a person faces a state of danger or severe hardship, such that they fear harm to their self, limbs, honor, intellect, or wealth, and it then becomes incumbent or permissible to commit a forbidden act or abandon an obligation to avert the harm.

Not every hardship is a necessity, and necessity is to be judged by its extent. If one is compelled to lie, and dissimulation (using a word with a distant and intended meaning) is possible, then lying is not permissible. But if dissimulation is not possible, for instance, if one possesses protected wealth and an oppressor approaches him, then he is permitted to lie in this specific situation only with a limited statement. And if one is forced to utter a word of disbelief, it is permissible for him to do so with his tongue only, not with his heart.

Cheating on an exam is not a necessity and is impermissible; it is forbidden by Islamic law due to the Prophet, peace be upon him, saying: "Whoever cheats us is not of us."