My 12-year old son is going to an international school in Bangkok. He entered Thailand on 3 January 2018, and it has been extended for 1 year on 30 March 2018 until 2 April 2019. So the current extension of the stay expires soon.
My question is, how can I extend the visa again? Is it same as the first time extension? If so, would be there any document required in addition to the following?
. Visa extension form TM.7
. Letter of certification from school
. A photocopy of the passport
. One recent 4 x 6 cm full-face photo
. Tuition fee receipt
. Grade report
Can you please advise? Thank you.