First, you need a good combo of both. It is important when studying to maintain a good sleep schedule, eat well and still take care of yourself. This might mean taking the occasional break to watch a movie, go to the gym, or have a dinner with friends.
If you feel stuck, step back for a moment, take a breather, and then dive back in. Just make sure your breaks do not extend overly long.
Also, look at HOW you are studying. At this point, you should be doing practice questions, or, if you are still at the outlining stage, be sure you are doing something active, rather than passive. This means rewriting things, making charts, making flashcards, etc.
Good luck!
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