One thing that helped me a great deal when I took the MCAT was when I stopped thinking too much. I know it sounds counterintuitive, but trust me. When I first started taking practice tests, I did horrible. I found that I was thinking way too much into the question, and the answers were much simpler than I thought. I changed the way I took the test. I tried to input as little of my own information as I could, and instead used the passage more. My scored improved dramatically.