The advice above is good. I would add a few more thoughts:
(1) This might be the most challenging exam you've taken since you started medical school. It was for me. I felt like I was guessing on a huge percentage of questions. So, be prepared to be stumped on some questions and be making educated guesses on MANY questions.
(2)There are some specimen photos on the exam, but not too many. Most questions with photos could be answered without even looking at the photo. So don't waste a lot of prep time on webpath or atlases.
(3) If you have some time to study and want to do well (not just pass), you might do all the questions in the Robbins question book. The questions are similar to the questions on the shelf, and it covers most topics.
(4) There are definitely some micro questions--mostly clincial infectous diseases type stuff. know HepB antigens/Antibodies.