Avoid locals that want to use you for free English practice. Such peops come across super friendly, and will usually speak to you first in Mandarin to assess their chances of sucking you in. I can’t tell you how many times I’ve had someone in my face trying to practice their spoken English without even listening to a reply. Best to politely tell such peops to jog on within the first couple of minutes.
I don’t mind helping a genuine friend with their English, to a certain extent, but won’t tolerate being used.
The cost of English classes in China is mostly out of reach to the general public, and competition is fierce for jobs in foreign companies or local companies that require employees to read and speak English. As such, many people will act according to their own interests, it’s only natural in such a competitive environment where a job could mean the difference between living a sustainable life, and poverty with no prospect of finding a partner or having a family.
Beware the unscrupulous woman that will gladly take her knickers off and give you the best blowjobs you’ve ever had in return for your native English ability, and, or naivety.
Don’t be afraid to stand up for yourself. Otherwise, you’ll get walked on at every turn.
All the best with your studies.