Active learning is the only way to learn the material. Do not waste valuable hours trying to remember masses of material. Do not become overwhelmed by the details. Instead, concentrate on the overall structure. Most students are generally much more interested in discussing current economic issues than in learning abstract economic theory and reasoning.
People learn in a variety of different ways.
The text and the lectures provide a number of different paths to knowledge. Furthermore, part of your final grade is determined by class participation. Take the problem sets seriously. Study with a friend. Do not hesitate to come to office hours or make an appointment if you have questions.