Yes, vet med will still require you to have good grades at higher. Doing a half a degree does not excuse you, unfortunately. If you're heart is set on being a vet, I'd suggest you re-do highers and do lots of work experience and reapply to vet med, without doing biovet. Graduate entry includes hefty fees, so would be best avoided (though I am not sure how it affects scot students in a scotish Uni, but that would limit your choices quite a lot if that is the case). You could ask the unis you want to apply to this questions, and they'll be able to give you a specific response regarding their institution, but from what I've heard I believe what I have said is true.