@James *******
it's the same for all ED visa? Because before I had Thai language school Ed visa and before 1 month it's finished, I got online university Ed visa from buriram without leaving Thailand. So not sure if that officer who got me the new visa cancelled the old one without having to leave. My thought process was to go outside Thailand 1 month before my Ed expire and try to get the new DTV but if I couldn't get it for some reason, I would still have my Ed visa to fall back on and get a new one. So now I guess I have to go to buriram regardless.