Economics.
My course is end of year exam intensive. Basically all I do is turn up to lectures and tutorials, take a few notes, play about on my phone, chat to mates. I rarely do the assignments that are set. The problem is: if I do the assignment, then turning up to the tutorial where they go over answers is pointless. Or I can't do the assignment at all, which is just annoying - and I'll get the answers in tutorials anyway. Fortunately for economics you barely have to do any reading or lab work, so you can spend most of the year not working too hard.
The main thing I do is revise very hard at the end of the year.