Retaking core classes that have C's

I know there’s lot of thread regarding retaking C’s and how is it not beneficial to retake these core classes, but how about for person who have very low GPA? I have these core classes that I took 10 years ago and I did not do well.

These courses I have taken back in 2008-2009 at community college:
Gen Chem 1: C
Gen Chem 2: C
Calculus: C
General Bio: C
General Bio II: D
Physics 1-3: All C’s
Genetics: D

Recently at university:
Organic Chemistry 1: B
Organic Chemistry 2: C+
Biochemistry : C+

Would it be more beneficial to retake all these core classes again especially for MCAT? or take upper division science classes like biology? My science GPA is low (2.5) and I would want to demonstrate adcom that I’m not the same student I was before. I can’t get any SMP or Formal Postbacc in this moment.

I am trying to do a two step process which is Postbacc (academic enhancer) then SMP. My end goal is MD/DO, but what else can I do to show reintervention?

How well do you feel you have a grasp on the topics from these classes? As I see it, you have two factors that would make things rather difficult about studying for the MCAT at this point 1.) It has been 10 years since you have taken these courses, 2.) Your first go around you didn’t achieve the level of success you wanted. If you cannot matriculate into a formal post-bacc program, I would just start by retaking these core prereqs, and rebuild the academic house from the foundation. This should give you some time to mix in some upper division biology classes you haven’t taken yet. It’ll probably be imperative this go around to ace all these courses, regardless if you’re in a formal or DIY post-bacc. Show those AdComms that things have changed, and you deserve a shot. Just keep working hard!

Best.