I don't understand English/American education system....can you please explain it to me ?

well it's hard to have a closed highschool unless its private, if you goto a public highschool be prepared to deal with the real public. Everyone is not like you and you are not like anyone else. There are vocational highschools if you know what you wanna do but most kids at 15-17 don't know what they want to do with their lives.