Your instructor does not like surprises. Please provide me with essential information as soon as possible. Below are two common such pieces of essential information. Things similar to these two I would also like to know way in advance if at all possible.
Disabled students who need a longer period of time for tests (as determined by the Student Disability Center) should contact the instructor at the start of the course. You will not be given extra time if you present this information just before a test.
Students participating in official university athletic, musical or similar events which causes them to miss a midterm or the final should contact the instructor as soon as they know of such a scheduling conflict.