They take the same classes as any other student that is expecting to go to college. Science, math, Biology, chemistry, physics, psychology (if your school has it). Contact the medical school you wish to attend to ask for pre course requirements.
Anesthesiologists are doctors. It isn't the high school classes so much as the college classes that will get you into medical school. In high school you need good grades so that you can get into a good college. And in college you will need good grades to get into medical school. After medical school, you then study to acquire your anesthesiologist certification.
You can take the ACT regardless of which classes you take. You can even take it before entering high school.
Classes that veterinarians take in high school would be biology (other sciences) and math
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To get college credit in high school.
It doesn't really matter what classes you take in high school or even in college. The grades you get are more important.
you have to take cooking classes
Your High School classes only have a value in gaining you admission to a college.
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Every high school is different. I don't know if there are any specific classes that you need to take. Not all high school's offer courses for animal science.
Yes they certainly can. They have an online website where teens can take highschool classes and complete it for their high school diploma. www.k12.com