@ nikhil
You are right, having that many classes back to back will wear you out... especially since the classes go right through lunch. It's hard to eat anything during that quick 10 minute break, you need a good 1 hour lunch break.
I would probably go onto the McMaster
Master Course Timetable and look up each of your classes in there. When you click on the course code it will bring up the other times that the class/tutorial/lab is available. From there, look at your timetable and see if you could possibly change one of those classes/tutorials to a different day/time without any conflicts. If you find that you can, then go into SOLAR and try to make the change by adding the new section. If it's full, then you're out of luck, but if it isn't full and you can add it, then drop the existing one and replace it with the new one to help balance the load out a bit.