Hi Ranbir,
First of all to get a Co-op you should have a valid study permit and a letter from school that declares that all the students in your program need to get work experience to get the degree.
To apply for Co-op you can do it online as well as offline:
For online
For offline
Below is the official canada website to get deep insight into Co-op and to download application package:
https://www.canada.ca/en/immigration-refugees-citizenship/services/study-canada/work/intern.html
Good Luck !!!
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