This is the most uncomfortable rule on the list and the one with the biggest impact on your semester. when you bomb something major, do not let emotion or instinct decide what happens next. run the actual math.

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Example

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This rule fights 2 cognitive biases at once. the first is sunk cost (arkes and blumer, 1985). students keep pouring hours into a failing course because they've already invested so much. the dangerous part: research shows conscientious students, exactly the profile of most engineering majors, are the MOST vulnerable to this bias. if you're someone who tries hard, you're more at risk, not less. the second is the planning fallacy. you'll genuinely believe you can score 94% on everything remaining because your "realistic" predictions are statistically identical to your best-case scenarios.

running the actual arithmetic short-circuits both biases by making the impossibility explicit before emotion takes over. it's not about giving up. it's about not bleeding hours into a course where every hour now produces almost no return, while another course is sitting there where the same hour could move you a full letter grade.

When to ignore this

When the course applies a significant curve. a 45% on a midterm with a 38% class average puts you above the median. always check the class distribution before running the stop-loss calculation.