OP, 40+ is a good goal, but I think everyone here is just trying to make sure you keep in mind that it is not a realistic goal. Obviously your goal should be to get every question right, just understand that it is not going to happen.
People always say on here that a 40+ is possible, as long as you're an excellent test taker, have thorough understanding of your basic sciences, and study extremely hard for the mcat in the months prior to taking it. The thing to understand is that this describes almost everyone who makes above a 34 on the mcat. The mcat is an exam that intelligent, well studied individuals take and end up doing poorly on.
Just because you can make in the top 99.9% on your SAT, or be the top in your class at your university doesn't mean that you'll be that high on the mcat.