Some faculties may give me an estimated mark or the cohort average if my grounds for appeal aren't accepted..
What would you rather? An estimated mark, or a 0?
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However, usually if it is NOT accepted, you get the 0. But a doctor's certificate (provided it's not forged) is meant to be a definite success with internal assessments. Because if you weren't ill enough to miss school you would've done the test anyway.
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There should be no reason for your maths department to reject your request. For your HSIE apartment, it should be accepted if it bothered you for over 50% of the time span you had to do it. (Because if you started late that's not an excuse, whereas if you spent the first 50% of the duration working hard even if the progress wasn't that great then got attacked by the virus the second 50%, keeping the assumption the virus is bad the grounds are reasonable.)