To answer the OPs original question:
I am someone with a lowish MCAT who was accepted to two MD schools and 3 DO schools, ultimately choosing one of the DO schools.
My first MCAT was 24Q.
I did bad because I did not study enough, did not know what to expect as a result, and had no endurance because I did not take a full-length exam to test this.
The wrong answers that I choose tend to be distractors. I go into the question thinking that I know the answer, but then read all of the answers, and when I get to one that I just can't rule out, I go back and forth and often choose the one that I didn't think of to begin with. I needed to stick with my instinct and not second guess myself.
Other wrong answers that I choose are because I did not
READ the question and answers carefully enough, and choose something that I should have ruled out kaplan/princeton review-style, like answers with extreme verbiage or answers that are wrong because of one word.
I get distracted if I put "B" too much in a row, notice that I haven't answered "E", etc.
In particular, in the bio section, I actually tend to get all or nearly all of the bio questions right, as I was a physiology major. BUT - so does everyone else. What people get wrong and what lowers their scores are usually the orgo questions. This is a curved test. Pretty much most people will excel on the bio questions because they are often the only thing on the test that even remotely correlates with the reason you are taking the test to begin with (being a doc)
Anyway, I could go on with reasons why I did bad, but you NEED to figure out why you do bad on "that test". There is a reason, and the reason is not "just because" unless you are not capable of self-analysis.
I did not get accepted the first time I applied. No interviews, few secondaries.
I used the above info, took the test again, and got a 29R. Not perfect, but good enough, hence the 5 acceptances mentioned above. The rest of my app was pretty good, but I'm no Olympian with award-winning research or anything. I was probably truly your run-of-the-mill white female applicant to many adcoms.
I am a good test taker now. I high-passed most of my classes, was in the top of my class, did well on both COMLEX and USMLE Step 2 - but not Step 1 (205)
My advice is: Even if you get in,
you need to be able to analyze your test performance, and if you do, it will help you immensely if you try to figure out why. "I need to study more" isn't good enough either, because it doesn't tell you why the studying that you did do wasn't effective (unless you ran out of time and didn't cover all of the material).