Intl students who started in 2020: how to file income tax return for 2020?

Due to Covid, wasn’t able to enter Canada in 2020. Paid my tuition, continued to study online until I was able to enter in 2021.

Didn’t file a tax return through my degree but I have to now since I’m working.

Would like to get the tuition credits from 2020 but I don’t know how to go about filing the return since I hadnt even entered Canada back then.