I believe that there is no universally applicable advice for what is required in preparation. It will largely depend on what you have done to this point. Are you US or FMG? How did you do on the shelf exams (if US)? How did you do on Step I?
Probably the best way to tell how prepared you are is by taking an NBME self-assessment exam. It costs $45, but will let you know how well you perform in the different subjects, as well as give you an overall picture as to how you might score on the real exam.
For any US student 5 weeks should be plenty of time, especially if you have been doing rotations, and still have much of the material fresh in your mind. I personally only took 1 week to study, but I took it right at the end of my 3rd year, so things were still rattling around in the back of my brain.
How are you doing on UW questions? If you are scoring in the 60s you will probably be fine, if you are in the 70s you should do excellent. My advice is to do as many questions as possible, no matter what the source. UW is excellent, if you need more questions I would also recommend Qbank, Qbook and USMLE Step 2 Mock Exam by Brochert.
