It's hard to shoot for a great MCAT score just by "studying" hard for it. Though there are some basic tricks you can pick up with some of the study guides/courses.
What you learn in your college courses are really what will prepare you best. The tests cover so much area of the basic sciences (bio, chem, organic chem, physics), its hard to ask "what do I need to know?". Put a lot of effort into these courses. Do well in them and make sure you at least know the basics. Just because your at a junior college, doesn't mean you education will be comprimised. As Deuce points out, a lot of large, big name universities are research driven, so undergraduate education gets comprimised.
Of course, if your a good test-taker...that'll help.