Where can I learn Japanese in Hengyang?

I think Hengyang is not suitable. Do you want to study in Japan for exams? Or just want to know about it based on interest? If it is the former, I suggest you go to Yanji Japanese School in Changsha to thoroughly study Japanese grammar and spoken English. I believe that after a period of study, you can pass the Japanese exam and study in Japan! If it is the latter, I suggest looking for some information on the Internet, just listening to that kind of open class and reading more Japanese cartoons.