You dont really need any to be a singer, maybe drama, but you just need a good voice and go to auditions!
Your High School classes only have a value in gaining you admission to a college.
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.
No high school classes, other then your core classes (math, reading, etc.) are required for a profession after high school
Drama
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.
You dont have to worry about taking any classes to be a lawyer in middle school,you need to wait until high school.
Answer: you need to take zoology in high school if you want to become a zoologist :)
art classes and photography classes
you need to pass all the classes even foods class
you need to take every literature classes writting and arithmacy
science
You need to take Invesments