A study permit will allow you
A study permit is not required for any program of study of six months or less that can be completed within the period authorized upon entry into Canada . However, you may apply for a study permit and your application will be considered. Having a study permit will allow you to apply for a work permit if your course includes a practicum/coop component. Having a study permit also allows you apply for new study from within Canada if you anticipate further studies. More
A study permit is not required for primary or secondary level courses if you are a minor child in Canada, except if you are accompanying your parents who are visitors in Canada (in this case you do require a study permit). Although it is not required, if you are studying, you should apply for a study permit (or to renew an existing one). CIC recommends that you extend your temporary resident status as a student (by applying for a study permit) rather than as a visitor. Note that before coming to Canada , a minor child always requires a study permit to study.