You should see University Regulations and Resources > Undergraduate > Examinations: General Information for information about final examinations and deferred examinations.

The exam schedules are posted on the McGill website, mcgill.ca/exams, normally one month after the start of classes for the tentative Examination Schedule, and two months after the start of classes for the final Examination Schedule.

Students are warned not to make travel arrangements to leave Montreal prior to the scheduled end of any examination period.