My University had a policy of letting you retake things and take the new grade. In the modern world, I think you should be able to retake the tests and rely on MOOCs. I'm not at all a fan of allowing failure to pass or even average for a first attempt in a hard subject to pass. I had a few courses that I should have failed and I never revisited them because I got a B or even an A.. Today I am falsely educated in most of those subjects.
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