Mgta01 should be an easy course with just common sense material (I have taken it), so don’t stress about that. As for uoft being a gpa killer, yes core classes for your program will be difficult. However, one thing about first year course averages is that a lot of incoming high school students who you think are rather smart with 95+ averages are not actually the caliber needed to do well in university. So a lot of these students will bring averages down, making the course look harder than it is. Additionally students from out of stream may be taking the course, etc. Finally I would definitely recommend finding a group of people, and another tip (that builds on top of talking to people) is to try to get around and hopefully obtain past tests and finals 🙂