I would seriously recommend Lippincott's Microcards: Microbiology Flash Cards by Sanjiv. It is just hands down the most effective resource for micro.
If you don't have time to get your hands on these or w/e I would recommend that you get the basic charts of g+, g-, DNA, RNA, etc and have those down and then keep practicing them until you can work a bug back and forth in its grouping in the chart. Also read through Phostons power points after you have studied micro it brings all of the high yields together.