Choosing a post-baccalaureate program vs. masters degree vs. non-matriculation to improve my grades before applying to vet school?

I am in a position where the degree I am receiving (BS, MS) does not directly apply to veterinary medicine. I have taken some pre-requisite classes ("pre-vet reqs"), but in some I have received less than stellar grades. I am also completely missing some pre-requisites like upper level biology courses or have only taken half of a sequence (eg: organic chemistry) because of the requirements of my current undegrad program. I would like to re-take some courses and take some new courses before trying to apply to vet school. However, I cannot tell if a post-baccalaureate certificate program is most appropriate versus just enrolling as a non-degree seeking students to complete my pre-reqs. For a lot of post-bacc programs, I apparently have 'too many science' courses to apply to them. Does anyone have any advice? Does anyone know anything regarding which program is more expensive, generally? #college #career-path #graduate-school #veterinary #medical-education #academic-advising #graduate-recruitment #prerequisites