Hi I have also tried to find ways of studying in Japan but what i do know is that they requier that you can speak proper Japanese and write proper Japanese, a way to test your abilities is to take the JLPT test this test is based on 4 levels
Japanese Language Proficiency Test - Wikipedia, the free encyclopedia more info is available about this test on this link
When it comes to studying in Japan they require that you have and education whit a master or bachelor degree for actually being allowed to study at for example Tokyo U
As you can see they are quite strict as to who they allow inside their country to study, this is probably because Japan has such a high educational level, and this is what i can help you whit a good tip become a member of sharedtalk.com is a great way to learn japanese and you can watch anime search for free japanese lessons on the net like this page here:
Kids Web Japan
it might seem a bit childish but this is also one of the more "easy" pages to start and learn japanese, which were also one of the first pages i used when i started to learn japanese nearly 2 years ago
Ganbatte ^_~