I was scoring 511/512 on those exams and got a 515 on test day, so it can definitely be done!
If you haven't already, you might want to go through all the missed questions on at least one of the AAMC exams. Mark why you missed the question in the drop-down menu and write down the topic areas that you missed as you go through. I won't lie, this is tedious work and it will make you want to take a nap on your keyboard, especially since you have already seen and spent mental energy on all of those questions.
Once you're finished, the score report page will tell you what % you marked as each category in the "why did I miss this?" thing. That helped me a lot--I had a lot of "misunderstood the question" when I did that the first time. If you know why you're missing questions, you can come up with a strategy to fix it that way. I figured out that I needed to highlight key words from the question (like "NOT supported" and "best describes") every time, and being deliberate about that helped my score go up.
If, on the other hand, you realize that you're missing most of your questions from a few topic areas, you can hit them hard and use outside resources (not just your MCAT books) for better understanding. I had to go back and re-learn induced currents in a variety of ways before I could reliably answer questions--I really like Khan Academy for this if you aren't using it already, but I'm sure there are plenty of youtube videos out there, too.