I have been to a school in Shuang 'an, next to the National People's Congress, called Global Language Exchange, in the North Third Ring Road.

Mainly speaking and listening, their classes are in the evening and will not conflict with your working hours.

I compared the prices of many schools, and I think the first class price there is very cheap and cost-effective. If we start from the basics, I remember they have a beginner's class, which is to teach from scratch. You can check their home pages online to find out the different levels of oral English classes and make an appointment by phone to see if it suits you.

You can audition for free and then decide whether to sign up or not. I think it's quite humanized. The transportation is also very convenient. The subway is Renmin University Station on Line 4, and there are many buses.

I hope I can help you, good luck ~