I think that you are quite mistaken if you presume that you could transform your weakness in such a highly-tested subject to a level of knowledge through which every question becomes ridiculously simple, in a few days!
most of the respondants on this threads have not acknowledged the fact that you identified it as a weak area, which means that you have already taken the first step in usmle prep: identifying weak areas.
if you truly want to significantly improve your performance in micro, then my advice would be:
1. study hard during micro course in MS2
2. pick a review book which actually explains info in detail and makes connections/correlations (vital for the 2-step and 3-step questions). I personally liked Kaplan, but my roomate used Lippincott and also scored well.
3. dedicate more than a few days for this (and any other) high-yield subject, especially if it is a weak area.
Good Luck