You should shoot for perfection on your mcat. Everyone is studying for it, so it is that more difficult to get that 30 than you think. To get a 10, 10, 10, out of 100 people, you probably have to do better than 85% of the population that takes the exam. And remember, people who are premed are usually top 10% of their high school class. To get a 12,12,12 or a 36, you have to do better than 95% of the population taking the exam. The exam isn't a joke. You need to study both princeton and kaplan and know everything from the science books and just hope you have a good day. It is a timed reading exam that takes hours of study to master. When you look at these forums, most people get 30 or above, but I'm assuming it is only the people who did well who post. I think 50% of the people who take the exam get a 24 or less. The only people getting into med school with a 24 are URMs unless they have a parent who has pull on the admissions committee. There are no gifts in the admissions process. Even if you work hard and get a bad score on the MCAT, you most likely won't get in. Everyone in my class had a 30 or above. Everyone was smart and talented. I had to work really hard in med school to be below average. It was humbling.
For me, I studied very hard the first time I took it many years ago and got a 24. I was mad at myself. The second time, I studied even harder and got a 33 and got into med school. The schools care about the score, don't kid yourself. I went from no interviews to many interviews. Med school is hard. It is a lot of memorization. It is hours of dedication, especially the first 2 years. Residency is hard, especially when you are sick and have to be up all night answering pages, doing procedures, managing 18 patients in the SICU with the attending at home... That is why they have this exam. If you can master it, they feel you are a candidate. They don't like students failing out of med school. It looks bad for their numbers.