There are 5 essential* documents that you need to have to be eligible to apply for a study permit in Canada and become an International student in Montreal, Quebec.
1- Proof of acceptance
The first and foremost document is an acceptance letter from a Designated Learning Institution (DLIs) in Montreal, Canada. You can find the list of DLIs here.
2- Proof of identity
To travel to Canada you must obviously have a valid Passport from your country of citizenship.
3- Proof of financial support
You must prove that you have sufficient money to pay for you and your family expenses during your study period in Montreal, Canada. You can prove this in several ways such as:
Guaranteed Investment Certificate (GIC) from a participating Canadian financial institution
Your bank statements for the past four months
Proof you paid tuition and housing fees
4- Letter of explanation
This is an Important letter to explain to the officer why you want to study in Canada and If you understand your responsibilities as a student in Canada.
5- Certificat d’acceptation du Québec (CAQ)
To study in province of Quebec, you need to have a Certificate of Acceptance from Quebec. Get more information here
* These are the most important document but you may need other documents based on your case. You can consult with a Regulated Canadian Immigration Consultant