The CRA will start accepting electronic tax returns by February 18, 2019. The tax-filing deadline for most Canadians (for the 2018 tax year) is on April 30, 2019. For those who are self-employed, or who have a spouse/partner who is self-employed, the deadline extends until June 15, 2019.
As a student, there are several free options to file your taxes, including software like TurboTax and uFile. There may also be free tax clinics in your area or school where they file your taxes on your behalf. Here are some resources you can check out:
https://www.savvynewcanadians.com/tax-filing-deadline/
https://www.savvynewcanadians.com/turbotax-canada-review-filing-your-taxes-the-easy-way/
https://globalnews.ca/news/4870976/canada-tax-deadline-what-you-need-to-know/