Is writing the names of absent students on the attendance sheet, in order to obtain grades while they are not present, considered cheating? And should the names of the absent be erased from the sheet upon seeing them, as a way of changing what is wrong?

This action is deception, lying, forgery, and disobedience. It should be denounced by hand, tongue, or heart, according to one's ability, while considering benefits and harms. If the harm of denunciation is greater, such as resentment and revenge, then one should not proceed with the hand but with advice. If they do not respond, then with the heart. If its benefit outweighs its harm, or if it can be done without their knowledge, then it is obligatory to do it.

Enjoining what is good and forbidding what is evil is one of the greatest good deeds, and its benefit must outweigh its harm. Where the harm of enjoining and forbidding was greater than its benefit, it was not among what Allah commanded.

Two groups err: The first abandons enjoining and forbidding, misinterpreting the verse: {O you who have believed, upon you is [the responsibility for] yourselves. Those who have gone astray will not harm you when you have been guided} [Quran 5:105]. The second enjoins and forbids without understanding, forbearance, or patience.

If good and evil are combined, one should consider: If the good is greater, it should be enjoined, even if it entails a lesser evil, and one should not forbid an evil that entails missing out on a greater good. If the evil is greater, it should be forbidden, even if it entails missing out on a lesser good. If they are equal, neither should be enjoined nor forbidden.