Hey, don't give up all hope just yet. I know it may be discouraging to see your practice scores so low, but you can still get through this. The best thing that you can do for yourself right now is to purchase an AAMC practice MCAT exam if you haven't already done so. Buy one of the later CBTs like 8, 9, or 10. When you get it, take the entire exam as if you were taking the real MCATs (no cheating and time yourself). The score you get on these AAMC practice MCATs will be a much better indicator of how you will perform on the real thing as opposed to the EK's practice exams. When you are finished and you have scored it, review the exam in its entirety. The important thing to notice is "WHY am I missing these questions?" There are really two ways to answer this: either it's because you don't have the prior knowledge to answer the question, or you cannot extract the correct answer from the passage. If it's the former, then you should go through your EK material again but more thoroughly this time. Take notes, highlight the material, make flashcards....anything it takes to remember the information. If it is the latter, then the best way to improve your score is to take many practice exams until you are at the point where you are comfortable reading and extracting information from the passage under timed conditions. I did not take any prep courses while studying for the MCATs, so may be other people can help you out there, but I do own several test prep books including Kaplan and Princeton Review. Currently I am using Kaplan more than TPR because it seems to be straight to the point whereas TPR can be a bit wordy.
Once you figure out where you are going wrong, then you will be able to talor you studying to improve on your weakness. However, it will be hard for you to figure out what your weakness is if you don't take a practice test. The best of luck to ya.