breaks would be a good idea
so that u have a window to beath, relax or do something else. Classes back to back can really get u bogged down. U wont really be able to pay attention to the prof. Also it wouldn't hurt to eat lunch and hour earlier or later
Im pretty sure u will have breaks that u can avoid, the worse case is 2 or 3 class back to back.
sometimes breaks can be as long as 4 to 5 hours!!! Hated second year, esply when ur commuting!