You can never be sure about the credentials of future employers but here are some ideas for getting information about them.
Get the contract before you go and read it carefully. You can also show it to somebody at the consulate if you think it is necessary.
Ask to speak to current and / or past employees. Ask these people specific questions that address your concerns. Don’t treat the conversation as a nice chat. Pay attention to what they say and follow up on anything that seems unusual.
Put the name of the school on website chat forums and get others’ opinions and comments.
Do a “google search” for the name of the school to see what comes up.
Good luck with this; I hope you get the job you want.
The information in this forum is intended as guidance. Tefl.net cannot be held responsible for any decisions you make.