That would be a bad advice as it is illegal to use false paperwork for your application. (in case the agent is doing the extension without the financial requirements)
You use 2 times 6 months statements for the visa extension application so you don't have to wait for the 12 months statement.
as long the 6 months statements are overlapping.
That is only for the bank book, The Bank Certificate and Bank Statement can be 7 days old but the Bank Book has to ne updated on the day of the application with a new transaction date in the book.
3 times (on Phuket) so far which are made public and several others which didn't made the news, and i don't think that a 12 month oversea holiday is something to look forward to for most people.