Do most Canadian schools require SATs, ATCs, or something else for admission?
Take a look at http://www.collegeboard.com
I checked a few Canadian colleges and they either didn’t require the SAT/ACT (it didn’t list any required tests), or they didn’t list their scores. If there’s any particular school you should check the site.
Most Canadians don’t even write SAT’s.
When I went to university in the 80’s, the only requirement was high school grades. In high school we have standardized exams in our last year, and our grades are partly based on those exams. Universities have minimum grade requirements for their various faculties. But my sense is that it’s pretty easy for a Canadian to get into even the best Canadian universities. My high school career was pretty underwhelming, because I was busy with girls and cars and maintaining a part-time job, but I got 90’s on all my standardized exams, and that was enough to get me into the Physics program at the University of Alberta, which is one of the better universities in Canada.
Now, getting scholarships to those universities is a different story 
Sam is correct.
Canadians don’t have to write SATs to go to university in Canada.
However, the requirements for international students are usually different - many have to provide TOEFL scores for an example. (Although, not typically those from the US.)
I would check with each particular shcool your interested in to see what their requirements for foreign students are.
Additionally, make sure to check with the particular program you’re interested in. I know that the Medical School at the University of Calgary (where I go/work) will let a maximum of one foreign grad in per year - if you’re from the US, that means you.
(Really, you have no idea how many times I’ve heard "But - I’M not a foreign grad - I’m from the US! :rolleyes: )
I don’t think McGill requires SATs. They do require that you be breathing, however.
Getting into university here is a pretty simple process. No SATs, just high school grades.
It’s even fairly easy getting into university in provinces with different high school systems. Ontario has a grade 13, and in Quebec, you only go to grade 11 but take two years at a special college called a CÉGEP. Even coming from a province (British Columbia) where students receive a paltry 12 years of education, I had no problem getting into a Quebec university (Concordia).
I’ve met one or two McGill students who make me wonder if they’ve relaxed that requirement 
It can be challenging for Canadian universities to judge applicants without a standardized admissions test. Some provinces have provincial exams, but not all do. Most schools use several factors, including previous applicant averages to adjust current applicant’s relative scores. This means that someone from a poorly performing high school or school board might have their graduating average bumped up for the purposes of comparison. Conversely, schools that have reputations as easy markers will have their graduates’ marks decreased.
Other factors considered by universities include participation in extra-curricular activities, courses taken at advanced levels, number of credits over the minimum, and memebership in equity categories (race, gender, disability, etc.). There are likely more factors as well, but that’s all I can remember off the top of my head.
Although there are tests to get into the professional schools, of course, such as taking the LSAT for law school or the MCAT for medicine/veterinary and I think nursing. Other than that, it’s all based on high school or CEGEP grades, or perhaps previous college/university if you have attended one before applying to the school in question. The best thing to do, however, is to look into the requirements for the schools that you are interested in, since they do vary a little.
As other people have noted, Canadian students do not write the SAT tests (unless they are applying to schools in the States).
However, I am an American citizen srudying in Canada right now. I am in my fourth year, so admissions things might have changed a little bit, but when I applied, all American applicants were REQUIRED to submit SAT scores. I applied to Dalhousie University, University of King’s College, Acadia University, and the University of British Columbia. I imagine that all of those schools required SAT scores from American students since there is no real standarized curriculum or tests in American high schools.
In addition, all of these schools also had a minimum requirement SAT score for their American applicants. However, the minimum requirements were pretty basic. I think that they were all 1000-1100 or so.