Well, a veterinary medicine course will mean you can practice as a veterinary surgeon when you graduate. A veterinary nursing course will mean you are qualified to be a vet nurse when you graduate, not a vet. So if you want to be a vet, do what 999tigger says which is reapply. Assuming you've done work experience in vet practices, you'll have seen the difference between what vets and vet nurses do, so that's the difference between the two courses...