Veterinary Degree - how to make myself eligable

Hey guys this is my first thread so im still a little unsure as to how this works, currently im in my first year of a bachelors degree in natural sciences at the open university but i have always wanted to study veterinary, looking at the current acceptance of qualifications im having to redo my maths at GCSE level, but this is my dilemma, referencing to liverpool university they have a year zero course so hypothetically speaking should i be accepted onto that and pass it would that grant me access to study the full Veterinary degree at liverpool or would i still have to go down the route of aquiring 3 A levels? If anyone has any information or chosen this route themselves i would be very greatful for any advice. Not that this is relevent but im 23 and i would like to get this done sooner rather than later!