Transfer here. Switching into artsci is a bit different than transferring into other programs. Given the unique nature of our first year curriculum, you can't just jump into second year (transfers usually end up doing a five-year undergrad, although it's not impossible to do it in four). You have to apply for level 1, meaning (atleast when I applied) they're primarily concerned with a high-school average of 88% and a solid supp app. However, they seem to have changed their policy a bit (see the artsci website) to take into consideration university performance. I'm fairly confident there's no official minimum requirement.
Possible Problem: Supplementary applications were due February 1, so if you're seriously considering the transfer then DEFINITELY schedule a meeting with our administrators to discuss the situation SOON.
I didn't apply in grade 12 either, but I'm really glad I made the switch. Artsci is an easy program to love. That said, remember that you don't need to be in artsci to get an interdisciplinary education that you're passionate about. Hope that helps
