I am currently on my last extension of stay based on an ED visa. This gave me a total of 9 months in Thailand. Planning to continue "advanced classes" (got the documents from the ministry of education approved). I will get a new Non Imm ED visa in my home country. My question: do I need to cancel this last extension before leaving the country? I heard this case is the only exception where I don't have to cancel the extension.
Thanks!