First, biochem, orgo Chem and inorganic (gen) Chem are all different. If you go by aamc or aacomas guidelines it counts toward you bpcm which is what the admissions office probably means. Most schools say you need a C or better, as in they will accept a C, or C+ but I would retake C- unless you are only looking to apply to a few select schools. However it your call. The grades will be averaged so at best you may end up with a B- which isn't a significant boost but it's all about how much money u wanna spend and how much time you wanna take. Since you're gonna do a post bacc and masters. I would go ahead and add the extra classes, but again, it depends on where you are applying.
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