Because time is the one thing that you're most likely lacking, try participating in a study group. These groups typically consist of members of the same residency class and offer a no-excuses way to schedule study time. A more frequent schedule makes it harder to coordinate schedules. Be composed of three to four people. This size keeps the group tight and supportive.
Larger groups tend to break down more easily.
Create a schedule to cover major topic areas each week and then assign individual topics. At each study meeting, members of the study group make a presentation about their topic. Work on case-based questions as well as exercises in memorization. It is advice that veterans of the exam like Dr. Brown endorse. Actually doing the questions and even finding out why the other answers were wrong really helped.