I want to give you some alternative advice that you can think about as well.
First, I want to preface it by saying that Im a re-applicant and I encourage everyone to follow their dreams and aspirations as I have done. But, one of the biggest choices in your life is what do you want to be when you grow up, and sometimes our decisions are influenced by outside forces that can lead us to pursue something that we don't really want, or don't fit into.
So, that being said...I don't know you or your goals. But, if someone I knew got a 13 on the MCAT the first thing I would do is help them figure out two things...
One: do you really need to be a doctor? Or do you like healthcare?
Two: Why did you get a 13? This is very very low. You would need to basically double your score to have a shot to get into a DO school. So, is this a reality for you?
My advice, really look at Podiatry. Pretty sweet gig, still a doctor and still make good money. And their MCAT scores might be in range of your capabilities.
It sucks to hear it at first, but there is a reality that not everyone who wants to can be a doctor. So, please take a while and think and talk to your life mentors etc.
OK, now that thats said. If you decide you want to be a doctor and you don't care if you have to sell your car and blood to take a Kaplan course (or even private tutoring, which is very expensive), you don't care if it takes you the next 2-3 years to get your goal score (not that it will,
but it might) because thats what you want out of life...you have my support! And I wish you good luck and perseverance through it!
If you decide to do something like Podiatry, I also support you in that! Its also very rewarding and people love it.
Anyway, this was a long post because I didn't want you to think that I was discouraging you...but I do think you have a BIG decision to make, and maybe being a doctor is not in your future.