https://www.canada.ca/en/immigration-refugees-citizenship/services/refugees/claim-protection-inside-canada/apply.html

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Claim refugee status at a port of entry, or when you've arrived inside Canada

https://www.canada.ca/en/immigration-refugees-citizenship/services/refugees/claim-protection-inside-canada/work-study.html

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Apply for a work or study permit so you can work / study here.

You can apply to a high school.

There are many community centres available to help you.

Try searching immigrants and refugees services in Montreal.

Sorry I'm unable to provide more information! Wishing you all the best.