How many bands do I need to study in Canada?

For Masters, a minimum overall score of 6.5 and 6 in each category.
For Bachelors, minimum overall score of 6 and 5.5 in each category.

Do you mean on the IELTS exam? You must score at least 6.5 on each part of the exam, and 6.5 overall as well. Some schools or programs (e.g. grad schools) may require minimum scores of 7.0 on each part.