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You should focus on taking the most challenging science and math courses that you can handle - physical science, Biology, chemistry, physics, calculus, statistics. All of these courses will be repeated with more in-depth material in undergraduate college (in the United States), so you need a strong foundation.
Take as many science courses as you can, preferably the advanced or college-prep courses if you can. Take as high-level of mathematics as you can - if you can get all the way through Calculus I in high school, your undergraduate pre-requisites will be much easier.
Other than this, take classes you enjoy - vet school doesn't work out for the majority of people who go to college to become a veterinarian. Explore other paths as well, and take some classes you enjoy if you can.
What else can I help you with?
What classes you need to take in high school to become a zoologist?
Answer: you need to take zoology in high school if you want to become a zoologist :)
What high school classes do you need to become an actor?
Drama
What classes do you need to take in high school to become a meteorologist?
science
What high school subjects do you need to become a pastry chef?
No high school classes, other then your core classes (math, reading, etc.) are required for a profession after high school
What classes do you need to take in high school to become a accountant?
You need to take Invesments
What high school classes do you need to know to become an author?
you need to take every literature classes writting and arithmacy
What classes do you need to pass high school to become a cook?
you need to pass all the classes even foods class
What middle school classes do you need to become an lawyer?
You dont have to worry about taking any classes to be a lawyer in middle school,you need to wait until high school.
What high school classes do I need to take to become a dental assistant?
all of them
What classes will you need to take during high school in order to become a teacher?
a lot
What high school classes in yr 10-11 do you need to take to become a lawyer?
In the US, the high school classes do not matter. What matters is how you did with your grades in getting a bachelor's degree.
What classes in high school do you need to become a journalist?
A heavy course of study in English will help.
