In most cases, a medical exam is not required when applying for a study permit in Canada. However, if you plan to study for more than six months or will be studying in certain fields such as health services, you might need to undergo a medical examination. The requirement varies based on factors like country of origin and duration of stay. Check the official website of Immigration, Refugees and Citizenship Canada (IRCC) for the most up-to-date information and specific requirements related to medical exams for study permits.