Initially, bio is like learning vocabulary. Repetition is key. Once you have a good foundation with the vocab, you'll be able to put the concepts together better.
One thing that helped me a lot was linking aspects of the PS section to bio. I had a good background in physio and physics, so when I thought about cardiovascular physiology, I used concepts I learned in physics about fluid mechanics and E&M to better understand the physiological principles. When I was learning about the renal system, acid/base chemistry really helped out, etc.
The MCAT is good about stuff like that (ie. it's not uncommon to see a physics passage about fluid mechanics using the cardiovascular system as the example). Things like these really helped me out, so they might work for you. It ultimately comes down to trial and error and figuring out which method helps you understand the material the best. What works for me or anyone else may not work for you.
