First of all, I think you should first confirm whether it is necessary or persistent to learn English. Frankly speaking, as a person who has studied in an institution before, adult English learning is actually very boring. Although some teachers will enhance their interest in class, on the whole, they can't do without memorizing words, grammar, oral pronunciation and so on, so I hope you will think it over first.

Secondly, if you think about it, you can search through Baidu map. Now all English training institutions have adult English training classes.

The better institutions are: Midland English (East Street), language education, and Japanese and Korean training (East Street).

I hope this helps.

-z-