In undergraduate college, you should focus on taking science and math classes, as well as a broad selection of gen-ed classes. This will help you get into vet school - in the United States of America, having a strong science background in undergraduate is a prerequisite of applying for vet school.
In vet school, you can and should take as many equine-focused electives as you can, or you can sign up for the equine track (in the vet schools that track).
English, math and science.
You cannot go directly from high school to vet school, and you cannot become a veterinarian straight out of high school. However, you can take some classes that will help you eventually become a veterinarian. Mostly you should focus on taking the most difficult math and science courses that you can handle - biology, chemistry, physics, algebra II, pre-calculus and calculus.
You should focus on taking as difficult of math and science classes as you can handle - biology, chemistry, physics, pre-calculus.
what high school classes should be taken in high school to be a RN
In the United States, it takes a minimum of seven years to complete the college classes required to be a veterinarian, so if you graduate high school at 17, the youngest you could be is 24.
High school level classes to prepare for college
No
That depends on the high school.
No
It depends on what high school you go to. Different schools have different language classes.
No high school classes, other then your core classes (math, reading, etc.) are required for a profession after high school
Yes, and college as well as vet school.