✔ 最佳答案
my high school had lots of exchange students.
their teacher grounded them thoroughly in japanese grammer and daily conv before they came to japan. some of them spoke really good japanese when they went back to australia and the us.
you can speak fluent japanese without basic. but i think you need more than couple of years to be fluent and need to speak japanese everyday at school.
you can go to japan to check how is it like. but you cannot understand japanese fluently in 4 mo. im very sure.
all languages are not so easy as your booklet says.
i think you better keep your money for some time and study basic. then go. use your money effectively.
i must apologize if you're rich as J. K. Rowling... :)