Did this a few times in my college/high school career (mostly college). I tried to go to class so I at least was familiar with the material, and if the situation was hopeless, more often than not I just picked my area/areas to be good and tossed the rest. It was actually somewhat of a relief to know, "Well either I'll get lucky or I'm boned", versus when things were tight and I felt I had to buckle down. Granted, things often worked out much, much better when trying to master that last 20% of the material than being pretty sure you had no chance with ~50%.
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