did you ever calculate the minimum grade required and then aim for it?

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Sort of, in my postgraduate program we were graded on a curve in each subject. Top 10% got an A, middle 60% got a B, bottom 30% got a C. 2/3 of your total credits have to be a B or higher to be pass the program. Just made sure I wasnt part of the bottom 30% in each class, which wasnt so hard, and when I got enough B credits I relaxed even more.