Well I'm now a 2L here and yes I did end up rooming w/a drinker, but one non-drinker as well. A great way to prepare is to work on legal writing. It's quite different than most writing and takes some adjustment. You could get a "bluebook" citation book and look it over, but they do change almost ever year. But that isn't the difficult part; the difficult part is learning to write decently in IRAC (Issue, Rule, Analysis, Conclusion) form.
Well back to finals prep. ~groan~