In order to successfully gain entry into Canada, every international student will have to prove proficiency in English or French. IELTS is the preferred test for proficiency in English, with some institutions also accepting the Cambridge English: Advanced or TOEFL exam score.
For French, you can opt for DALF, DELF, or TCF, although the TEF exam is the most common option. Choose the test, pay the fee, and book your dates well in advance. Of course, you will have to brush up your language skills to ensure your application does not get rejected.