High school classes to become a veterinarian?

I am needing to know some information about becoming a veterinarian. I am currently a junior attending high school. My goal for my future career is to become a veterinarian or vet tech. What I am needing to know however is what high school credits are needed in order to get into college to start working towards the goal of a veterinarian. **A little background info... I was needing 1 last science credit for high school graduation, so this year I have taken 1 semester of chemistry for .5 science credit and now I am taking .5 credit of marine biology to make 1 whole science credit when putting them together. Is a full year (2 semesters) of chemistry needed to become a veterinarian?