There is nothing specific to being a pediatrician that you need to take in high school, but you do need to do well in all of your life science classes and chemistry.
what high school classes should be taken in high school to be a RN
No. You only need to have really good grades in the classes you take, get into a good college, get great grades in your college classes, and go into medical school
english, science, math
All the baby classes!
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chemistry
You should take some culinary arts classes while in high school. You should also take all of your regular classes.
you have to take cooking classes
It doesn't really matter what classes you take in high school or even in college. The grades you get are more important.
Take any classes that revolve around or touch upon your interests. Also, look into an English course; "When your in high school" should be "When you're in high school" and "your not sure" should be "you're not sure."
The classes you take in high school only aid you in being accepted to a college or university. However, some of the courses may be in the health science field, which would help you in your decision. To become a pediatrician, you will need to obtain an undergraduate degree, be accepted to a medical college and then do your internships.