They'll let you try out a lesson. And they will act as a student to ask you some questions. And make sure you are good at teaching online. Very easy to pass
I applied online. The process took 1 week. I interviewed at HD Education (Hong Kong) in Jul 2022
Interview
You need to record a short video of about 15 - 20 min to show your ability to give lectures. Then HR reviewed it to decided offering you an interview or not.
Interview questions [1]
Question 1
Why did you choose HD education, and what makes you competitive to become online educated?
The interviewer asks you to choose a subject that you are willing to teach and do a short class in front of the person. It's relatively easy and you just need to be correct and clear.