Commuting to Mac is difficult, that's for sure. I commuted first year from Brampton and I'm in engineering...and I will never do it again :( If I recall, I had about 5 hours or less of sleep. I would end up falling asleep during lectures, which was bad. To be honest, I was really tired a lot of the days, and drank coffee and energy drinks non-stop. Everything was a blurr in first year lol.
It all depends on if you'd rather come home early, which means having 830 labs/classes or come home at night which allows you to have less morning classes/labs (if it's possible). I didn't want to stay late, so I had the 830 labs 4/5 days and I would finish around 330-430. Try to avoid rush hour.
Occassionally, I would have 2-3 hr breaks and I would bring homework. I lived at the library, and that's all I did was work...or end up falling asleep doing work. BUT you'd have to carry the heavy textbooks all day, which is annoying. My commute was about 1.5 hrs, so I used that time on the bus to catch up on sleep
or to catch up on readings. If you have late night tutorials, such as for math (some of them run 530-620), if you feel they don't help you then don't waste your time going to them.
Like Andrew said, time management is important. I really didn't have time to do anything else asides from school which kinda made my 1st year crappy. But IF you can manage your time extremely well, commuting and doing well in school is totally possible. Good luck!
but I'm sure it'll work out fine once you adjust.
