if you look in 'Files' under 'What's new?' at the top of this group's home page you will find a list going across the page, of content. The last item is 'Files'.
In 'Files', the top file is 'Retirement 1 year extension requirements pdf'. I think this list is good for Cheang Wattana.
You also need the 8th file down '4 forms. pdf' it helps if you complete these before going as well or you have to complete there.
comments about the year statement taking a while I walked in and asked at my bank, Kasikorn, and they said they could print a year's statement while I wait, unfortunately, this is a tiny branch and while they can give me the statement, no problem, they can't give me the bank guarantee letter, as this small bank doesn't have that password capability so I'll go back to last years bank, just further away.