Class is only a quarter of your course. New university students often make the false assumption that if they attend most of their classes, they are doing the course. But at university, the sitting in class is only a small part of the work. Most of the course is reading the assigned material, doing research for assignments, preparing presentations, meeting with your prof in her office, and writing essays. You should be doing at least three hours of work outside of class for every hour of class time.