you need 90 credit hours of pre-med courses to be eligible for any & every US state licensure. that should include 1 yr of each of gen bio w/ lab, gen chem w/ lab, org chem w/ lab, phy w/ lab & eng (or related). if you have all of the above with a 3.0 on a 4.0 GPA scale, ure good to go. else u will have problems if you're missing a course or even a lab. med schools will let you in, giving you some leeway, but its you who will have to face the consequences later on.