Heya
Im first year at Edinburgh. I dont know if i can be of any help (you can always pm me if you want) but here is a rough outline of my work experience:
2 weeks working farm park open to public,
1week beef farm
2 weeks Blue Cross Small animal hospital
7 weeks mixed vet practice
day at pig farm
worked in a stables from age of 13-uni
been on sheep farm/lambing from tiny until age of 13
However getting into vetschool isnt just about work experience and academcs. The applications panel also look for a well rounded person wh can fit in hobbies etc as well as doing everything else . For example i was a guide leader, head of house at school, horserode weekly etc and also had certicicates in stuff like first aid etc.
Im not trying to tell yu all this to advertise my CV but just so you can see the sort of stuff you need to have on your application. ITs also crucial how you write your personal statement and f i was you i would try and get input from as many people as possible, not just from school. I had a very helpful final year vet help with mine!
Anyway good luck and if you want to know anything feel free to ask me.