What is the process for extending a stay in Thailand as an educator at Chaengwattana?

I would like to share my experience for extension of stay based on being an educator at chaengawatta.

I booked an appointment for 9:00. I wasn’t given a queue number but had to notify the counter in advanced of my booking. I showed the officer my appointment on my phone and was seen at 9:05. I handed in all the required documents and paid 1900 baht for the extension. I waited ten minutes and then picked up my passport.

I was out the door at 9:35. Absolutely phenomenal. I have never seen such a fast service at chaengwattana.