I'm pretty positive that U of T's Social Sciences program does not include Psychology. I was interested in them but realized that you can only get a Bachelor of Science in Psychology.
With that said, you need to think about what you are interested in doing with Psychology. If you are interested in the biology + science part of it, there's always the B of Sc at UofT and McMaster (Life Sciences). Typically, the PNB program at Mac for Bachelor of Arts and Science students are the same but with Social Sciences, you just need to take Calculus (and Grade 12 Biology is fine as prerequisite) compared to the Sciences.
I like the Social Sciences program mostly cause I just enjoy ALL the Social Sciences! I can't really say much cause I don't know how other schools are but it's not amazing but it's not bad either. Lots of readings and writing to be expected. But I prefer it much better than the Sciences where you'd have to take Chemistry and Biology.
(Cut off average is usually around 75%, not very hard to get in)