Agree. Indeed, the US high school standard of 90% = A, 80% = B, 70% = C, 60% = D (or something similar) means that high school teachers tend to load up tests with easy questions so that C/D students can pass the course, with only a few harder questions to distinguish between C, B, and A students. College instructors not bound by the US high school percentage to grade mapping are able to include a greater percentage of medium to hard difficulty questions relative to easy questions in order to better distinguish between C, B, and A students.
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