Some Canadians are familiar with the terms freshman, sophomore, junior and senior but that's from watching US college sports. We simply don't use those terms to describe our level of achievement either in high school or university. If someone ask a university student where they go, they would most likely respond, "McMaster, 2nd year" or something like that. You would almost never hear people use terms like sophomore or junior when describing themselves.
For sports, some areas use freshman or even midget to describe grade 9 basketball. Junior basketball is for grades 9/10 and senior ball is for grades 11/12 in Ontario. The terminology that Americans use is simply not used that much in Canada.