Hi, Sam,
If you go back through earlier posts on this site you will find all the information that you require.
To start with you need a very good range - 8 to 10 subjecs at not less than B grade at GCSE, including Chemistry, Biology and preferably Physics, then A levels at A or A* in Chemistry, Biology and Physics or Maths at least.
The course at university to qualify as a vet takes 5 years, and the entry is very competitive. There is no 'easy alternative'.
W