Please help, what am I doing wrong?

Hi everyone, I really, really need some advice. OMS-I in the second semester here. Our test next week on Monday is covering Immunology and Physiology. The problem is, it's going to be on 20+ Immunology lectures and about 15 Physiology lectures. Physiology I don't have a problem with. Immunology is the problem. There's SO much and I'm SO behind. It takes me 4 hours to get through one lecture with listening to the recording and memorizing it. Just a couple of lectures can take up almost my... Please help, what am I doing wrong?
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