If you're taking the June LSAT, I would enjoy this semester to its fullest, then start studying along with your regular studying next semester. Take a class as well, unless you take multiple practice exams and don't get less than a 175. The courses will really discipline your studying so you keep up with it.
If you want a book recommendation, I used Princeton Review's "Cracking the LSAT" and did better than I expected. But that's just me.