If I’m an international student but already in Canada in high school, do I have higher chances getting an scholarship for international students?

If you’re an international student in grade 12 (that is, not a Canadian citizen or permanent resident), you’ll still be considered international in college or uni (at least until you receive citizenship or PR), so you’ll have access to scholarships intended for international students. There aren’t many awards for international students in high school. You’re considered a “domestic” student if you’re a citizen or permanent resident.