How difficult is it to get into UofT if I’m an international student?

I am doing my best to speak with guidance counselors and other people who have gone to college, but it is difficult to get all of the info I need. Currently, I am on track to graduate a year early from my high school and I planned to take a year at a community college nearby my house because the classes are cheaper than going straight into college. My grades are all above 90% and I got a 1390 on my SAT (I planned to retake it in the winter). Does anyone know how credit transfers work if it’s international? Also, I’ve been seeing that getting into UofT is easy, but staying in is the hard part. Is it safe to assume being international would make it harder to get accepted? I want to pursue a career of Astrophysics, but would most likely be getting my major in physics.