It is not even the same in the rest of the US. K-12 eduction in the US is by states, so what your state does is different than my state - we have a 40 course requirement even though some schools have a 48 course requirement. When I grew up we had four years of five subjects (Math, Science, Social Studies, History, English).
To answer your question about Japan, they have a variety of requirements for HS.
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It is not even the same in the rest of the US. K-12 eduction in the US is by states, so what your state does is different than my state - we have a 40 course requirement even though some schools have a 48 course requirement. When I grew up we had four years of five subjects (Math, Science, Social Studies, History, English).
To answer your question about Japan, they have a variety of requirements for HS.