Мне сегодня рассылку Prolanguage school присылал, что они могут конвертировать в ED визы без выезда из
Visa on arrival 15, 30, 45, or 90 days
Tourist visa 60 days
We CANNOT convert Non-immigrant ED/B/O to ED visa inside Thailand.
Case by Case consideration. It will depend on what kind of visa you currently have.
Therefore, we will check the passport on a case by case basis to make sure again.
** The school will handle all the paperwork to confirm the smooth running of the visa process.