https://www.dndbeyond.com/sources/sacoc/school-is-in-session#Exams
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Make any ability check you want against the exam's DC. Success = 1 reroll
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Pulling an All-Nighter: automatic 2 re-rolls at the cost of 1 level of exhaustion (disadvantage on all ability checks)
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Studying together: gain advantage on your studying phase ability check
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Skip: you can skip studying and forgo any chance of earning rerolls
You make two ability checks, determined by the exam, with a DC also determined by the exam.
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cheating: pass a deception and a sleight of hand check = you ace the exam. If you fail at cheating, you flunk the exam
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failing: fail both checks = remedial tutoring (no jobs, no extracurriculars) until you pass an exam.
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passing: pass one check = get 1 student die
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aced: pass both checks = get 2 student dice