Hi, Sammy,
It is very difficult to become a vet.
You will have to work hard at school, especially in science subjects, and aim to get at least 9 O levels at grade A, and A levels at A or A* in Chemistry, Biology and Maths/Physics.
The course at University lasts for 5 years, and you have to find the mony to pay for teaching fees as well as your board and lodging, either from your family or by taking out a student loan which you have to pay back when you start work.
If you really, really, want to be a vet, you will find a way.
W