When Sims take the Final Exam there is a random Loot where they cheat and either fail or succeed at cheating. Every Sim that is not at least lvl 4 in Mischief has a high Chance to fail and get caught. I changed the random loot a bit: Only Sims with at least level 6 in Mischief should cheat and only have a chance to fail when they have the Clumsy Trait.