To avoid late penalties, you are always welcome to hand in your homework earlier, by making separate arrangements with the instructor by e-mail.
This form should be filled in by you and your doctor, and then presented (along with any other supporting documentation) to the instructor as soon as possible.
If your claim of illness is found to be valid, and you are excused from writing the test, then the corresponding course grade weighting will be shifted to the final exam.
(For graduate-only courses' final exams, the above procedures still apply, with the corresponding course grade weighting then shifted to a make-up final exam of the instructor's choosing [including perhaps an oral exam]. For undergraduate or cross-listed final exams, similar policies apply, but they are enforced separately by the Faculty of Arts & Science.)
Then give this piece of paper, together with the original unaltered homework/test solutions, to the instructor within one week of when the graded homework or test was first available. All regrading requests must be done in writing -- you may not argue your grade in person.
Your claim will then be examined. If it is found to be valid, then an appropriate adjustment to your mark will be made. The regrading decision of the instructor is final.
WARNING: If your regrading request is found to be spurious or unconvincing, then the instructor may also choose to re-examine the grading of your entire homework or test, with a critical eye, and may decide to deduct various points. So, your mark may end up going down rather than up. Thus, you should only request a regrade in cases of genuine, clear grading error (e.g. incorrectly adding up the marks, or marking a solution as wrong when it is actually correct). You should not submit regrading requests which are merely a matter of "judgement" about how many points a partial solution is worth. You have been warned!
(For graduate-only courses' final exams, the above procedures still apply. For undergraduate or cross-listed courses' final exams, similar policies apply, but they are enforced separately by the Faculty of Arts & Science.)