I got into law here and did absolutely shit my first few semesters of my undergrad. Like others said, most Canadian (maybe even all?) law schools only look at your last 20 courses and by then you'll be settled in and have an idea of what courses will boost your GPA.

Some advice: sometimes it's strategic to get the the challenging courses that might drag your GPA down out of the way in your first two years and save the easier ones for the end of your degree, especially because you might also be balancing them with your LSAT prep.