[ryuurui]

Schools have many levels and many different courses. You could go for one to one lessons. I have studied in one of the schools in central Tokyo back in 2002 for nearly 2 year period (KAI Japanese language school), so I am telling you this from personal exp. They pissed me off at certtain point, however, I met there some really good teachers.

Studying with Chinese and Koreans will give you a good reason to study your butt off. Chinese will have issues with grammar, and Koreans with learning kanji. You will have problems wit both, so it may be challanging, but where is the fun without a challange.

Last thing. If you do not hve the time to devote the whole day to studying, you won't progress as fast as you should. I remember studying 10h plus a day sometimes. Koreans could not catch up with the kanji ;-).