Our first micro exam is in a couple weeks, and will cover the first 7 chapters. I'm taking Micro with a full load as well, which includes A&P I, College Algebra, English Comp II, Biomedical Ethics, and Psychology of Development. The way I've worked out my classes so far is to just pace myself and make sure I etch out a slot to study for each class.
For Micro, I am studying the same way I'm studying for A&P. I'm using flashcards, recording my lectures (which for the first time ever, is working awesome for me. My professor speaks so fast, when I re-listen to the lecture where I can pause to catch up on writing my notes, I end up with an extra 3-4 pages of notes I would've otherwise missed). I'm also using YouTube videos, and just searching for whatever specific thing I need clarification on. And, of course, reading my textbook, as well as highlighting and notating any specific parts that I can add to my lecture notes that helps fill in the blanks.
Also, make use of your professor's office hours! Anything that isn't clear, go visit them. Or see them after class, if there is time. Heck, I spent nearly a half hour with my micro professor the other day after class, just because I wanted to clarify something. She was so happy to see me so interested in the lecture, that our 5 minute clarification on one little thing turned into a 30 minute discussion on viruses, which was pretty cool. Your teachers are there for their students (or, at least, they should be!) so don't hesitate to go see them during office hours to go over anything you were unsure of and need some clarification on.