You may find Step 2 CK to be more reasonable than Step 1. Learning as much as you can during M3 clerkships will help you retain info and be ready for step 2 CK before you really need to review.
I used Crush the Boards for Step 2 - It is an excellent book. Try to read it at least once. Twice if you have extra time and have finished nearly all practice questions.
USMLE World question bank is the secret to being prepared for Step 2 CK. It is reasonably priced and the questions are great practice. They may be a little tougher than the real questions, but this will serve to your benefit. The explanations were great, and really helped me to remember things. After seeing several topics repeated while taking tests pooled from all subjects, I came to be familiar with things I was unsure about before my studying. Topics that are repeated are that way for a reason. I found USMLE World to be an excellent tool for preparing to take Step 2 CK. Good luck.
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Alpha Omega Alpha
http://www2.uic.edu/stud_orgs/hon/aoa/