Let's break it down (by courses I took):
Geog 1HA3 - I got an 11 (A). You have some assignments, and the tests were fairly easy. You need to be a strong writer to excel in this course - greater weight allocated to assignments, etc.
Econ 1BB3 - Very good course, professor O'Shaugnessy is cool. Understand lecture material thoroughly (can be reinforced through her amazing podcasts), and you'll do well. I got a 10 (A-).
Comp Sci 1BA3 - Other people say this course was easy in the past, however, the year I had, it had been revamped. Do the readings, and understand the lecture material. Some of the MC questions are tricky. I got a 10 (A-)
Math 1M03 - If you are mathematically incline, you will do well (duh). A lot of my friends didn't do too well in this class. You do not need to practice every night - the calculus you learn (single/multivariable differentiation, integration, etc is at the most rudimentary level. All I did was study from the practice tests. I got an 11 (A)
Econ 1B03 - For some reason this course did not click for me. I could blame it on the professor (boring, just reading her lecture slides) - I did not do too well - got an 8 (B). Everyone says this is the easiest class, I don't see how, I did better in macro.
GEOG 1HB3 - I had it with the same professor for 1HA3 (Mercier). The professor is good, the format was identical to 1HA3 - heavy weight towards assignments, etc. If you understand the lecture notes well, you well do well on the tests - no need for textbooks in this class, or 1HA3. I got a 10 (A-)
COMMERCE 1E03 - A lot of people (not my group), got ripped on the report. A lot of turorial averages were failing grades. Anticipating this, I elected not to be in a group with my HS friends (who were even my rez room-mates). I was lucky, I got an excellent group. Overall, we got an 82 (including the presentation). Her tests are very easy, however, if you do not do well on the report, I do not see how you can get an A in this class - unless you get 90s on the test, which is possible. I got low to mid 80s on them. The exma was easy, too - got an 88. Final grade 11 (A). All my group members got this grade, too.
Only buy textbooks for: Commerce 1E03. I made the mistake by spending ~500 on semester 1 textbooks...