Any advice on retaking undergrad courses?

Hi all, I'm a nontrad. I graduated in 2016, but some of my pre-reqs were taken as far as 10 years back. From some Dental schools: I was told it's important to retake prepreq classes. From other Dental schools: I've been told as long as I'm taking higher-level courses, I don't have to retake! So my BIG questions are: does a D in microbiology + an A retaken in microbiology: 1.0 + 4.0= 2.5 in micro? and/or a C in Chem2 + an A retaken in Chem2: 2.0 + 4.0= 3.0 in Chem2? or is it more... Any advice on retaking undergrad courses?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Dental Source Type: forums