试卷是一张微凉过后的遗书
[shì juăn shì yī zhāng wēi liáng guò hòu de yí shū]
This poetic nickname compares a test paper to a letter written before parting, implying feelings of resignation during exams or significant stress from academia. It's a melodramatic way to express the intense pressure experienced by students facing challenging tests, feeling as if they are saying goodbye.