It may sound curious. It is a simple fact that Japan had no trade relationship with China and Korea in accordance with US orders until 1960.On the other hand in compulsory education pure science and classics such as Chinese poem were only taught following educationists coming from New England.
That's why English,Math,History,Science,Japanese classics, Chinese are lessons here..Communist don't teach pure science but put political subject on behalf, Lessons like here are enjoyed by people.