How can I try to long term visa and to get Thai passport ,how long takes time to get Thai nationality as an Iranian guy.

Does anyone know where should I ask and what document do I needs?!

Hi. Happy new year! 🥳 I have a visa question for a friend. He is an Iranian with ED visa and currently studying at a private language school in Thailand. He also just got accepted into a master degree program in Thailand for environmental studies. For this new program, he will get a new education visa to study two years master program. He is from Iran. Can he change his current language related ED visa to a new ED visa for the master program while he is still in Thailand or does he need to leave Thailand and come with the new ED visa? I read somewhere that unlike tourists visa, ED visa cannot be changed to a new visa and the person need to leave the country to get new visa. Appreciate any information.