I got stopped at airport and requested to speak Thai because of my previous Ed visa, I had no return ticket but the officer suggested having one next time but he only said that because of the Ed visa, I came from Australia every time without return ticket
my school organise everything they just tell me when to go and they met me at the immigration the first time to help do it, the school if they organised it should be helping you if it’s a legit visa with school
mines damaged and was fine for Thailand but they did question it in Vietnam but I said it was wet and now dry they said it’s ok, they were just concerned of the stamp if it was still wet