Dear Atitiya,
I'm Tim, I'm an English teacher in Thailand from London in England. I have been in Thailand for three years.
To address your questions, I don't know much about the student exchange program and I don't know anyone who is involved with it, so my perspective is limited at best.
I personally am not involved with it but I generally think cultural exchange is a great idea and I hope it works out for for you.
I'm sorry not to provide more full answers but I'm not fully aware of the program.
Thanks for your email and I hope, in some way, I reply has been helpful.
Sincerely,
Tim.