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.