It's really simple when you are signing up for classes just have an early morning class, 7:00 or 8:00 in the morning. and leave yourself a few hours between your first one or two classes and the rest of your day.
This gives you a chance to do homework, study for tests, eat breakfast, and whatever else you need to do.
i usually go to the library on campus for a nice quiet environment. but if you study well with background noise then i suggest that you go where you will be most productive.