[Hatredcopter]

Let me put it his way..

The only way you're going to be able to accomplish something like this is by going through an actual exchange program facilitated by a Japanese high school. I'm not even sure it's even possible to do this without being part of an exchange program, and if it were possible, the language barrier and money would be a huge problem. You'd need a boatload of money to get this done, and how could you possibly attend a Japanese high school without knowing Japanese? Four months spent in Japan would get you a decent start in learning to speak Japanese, but not read Japanese. It takes years to learn to read Japanese, and I'm pretty darn sure your homework isn't gonna be in English...

I don't mean to be discouraging, but you have to look at the reality of things. If I were you, I'd graduate in your home country, and then study abroad once you're in a university. It'll be a lot easier, with a lot less hassles and issues to worry about...