Can I be selective in revision?

Hi everyone!

I am a first year undergraduate and I am really really panicking about my exams. I have been such a bad student this year. Hardly attended any lectures and haven't studied much. I am so far behind on my reading material.

I have started revising and reading as much as possible, trying to grasp everything. All I want is to pass my exams this year and progress to the 2nd year. Do you think I can be selective in revision? I have contract, public, tort and criminal.

Any suggestions as to whether I could leave some topic out?