You need to be honest with your self about why you are getting the scores you are getting, then take it from there.
If it is test anxiety, it doesn't matter how much you study if you are not constantly remembering that you are studying so you won't have anxiety. Believe me, you HAVE to be proactive about your anxiety and figure out how it manifests. I have done several simulated practice runs. I have intentionally thought about how important the test for getting into medical school before I started and then brought myself back down. It might sound silly but I would rather practice being freaked out and getting over it than have to do it cold come real test time.
Sometimes it is the "voice" of the test. Going back and slowly analyzing a previous practice test brought my score up 2 points. It was a matter of really understanding what they are asking me and why. I have been studying with ExamKrackers. I like it a lot but the sound of the questions is so incredibly different from the AAMC tests that for the last two weeks I am going to focus on reviewing the tests.
If those are two things are your problems, you need to address them directly and there is a chance you can improve 10points. I once failed a test that I knew every answer to (electrical fundamentals test and my husband is a PhD electrical engineer so I had all the help I needed). I sat down after I got the test back and filled out every answer in about half an hour. That is why it is so important to address if it is test anxiety!
Finally, if you simply do not understand the content, push it back. Unless you have a tutor that can help you, it seems rather difficult to bring your score up that much on your own with a time crunch.
Basically, really figure out what is holding you back. If it really was all of the distractions, then why are you so distracted so easily? This test can make or break, you have no time for loud folks in the library, so don't give them any. I realize it is difficult but that is the mind set you need. It is your test and your chances. Own it.