Retake Lecture and Lab?

I'm starting a post bac next semester and I'm not sure if I should retake both lecture and lab for chem and physics. I previously got a C in chem lecture and a D in chem lab and a D in physics lecture and C in physics lab. Should I only retake chem lab and physics lecture where I got lower than a C, or retake both lectures and labs since I'll have to retake one for each anyway? Thank you for any advice
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Medical (MD) Source Type: forums