First figure out your learning style, are you a visual or auditory learner or both? Once you figure out what kind of learner you are, you will start to grasp onto the materials better. Personally for me, I am both a visual and auditory learner. During lecture I would record it and take notes, and then when I get home and study, I would play the recording and write down anything that I may have missed while writing notes. Watch videos and look at images as well. Also read your textbook. And if possible, make a study group. I found it very beneficial to study with others too.