Can I extend my Ed visa until 9 August or do I need to apply for a new one?

University students won't have to leave. Just take all your documents to immigration. Thammasat should have prepared everything you will need. I did the same thing. You won't ever have to leave unless you stop the course, but since the internship is through the university you're all good.

That is why I asked but did not get an answer. It seems he is attending classes at the Thammasat University and talking he heared something about regulations of the Extension of Stay for a language course at one of the language schools. For a course at a University there are different requirements and regulations.

If you have the letters from the university it means that it has been formalized by the department of education and you have a small window before those documents expire I believe. So at this point I don't think you have too much say on extending anything.

@Robert ******

Does he have to leave Thailand and go to a consulate to apply for the new ED? Maybe I'm late to the party on this one.

Either way your school should be giving you instructions on just exactly what you need to do and where you need to go.

If you think you have everything, go and apply at Immigration Office.

And this internship is part of your education? Than you have to speak with your school how to deal with the documents as they have to provide most of them to get the Extension or even for a new visa.