Most larger camera backpacks have a slot for a laptop, which can fit a notebook/binder if needed.
Most lowerpro, if not all of lowerpro's systems, all have removable dividers on the insides, so when you aren't carrying the camera, its essentially a large backpack with 1 big pocket.
However, putting the dividers back in place is a bit of a hassle, be warned in advance.
When you remove those dividers, you essentially get a big open space. Personally, i usually just put a thick sketch book in the notebook compartement and a reading book in the front pocket.
Definitely try them at a store, because theres no way to know what kind of size requirements you would need for your school supplies.
Hell, if you're lucky, you might be able to figure out a way to use the dividers to keep your school books And the camera. Im quite fond of lowerpro's velcro dividers systems, i wish they left more room for customizing by putting more velcro in, but i've gotten quite a few odd layouts myself and managed to fit more then recommended heh.
Well, hope that was helpful, good luck to you.