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I had classes where it would be even more than 25%, in high-school.

I had an anatomy class that was essentially busywork the entire year. He would do a test-review on Friday which would correlate 1-to-1 with the actual test. No missing, and no extra material in the review--no guesswork as to what might be on the test. Taking notes on the review was given a grade, even (showing him lengthy notes got you a 100%)--that's how important the busywork was.

"Piss on the learning, take these unnecessary notes!"