okay,
@Pe**
we're talking about TWO totally separate things
Your current extension based on education is coming to an end and you are not able to get it extended any longer <- that means you got extensions as long as you could on it
AND
You have paperwork to take to a thai consulate in another country to buy a new 90 day single entry ED visa to start another part of your studying.
BUT
You can't do that right now because while you can get out of the country, you can't get back in..
SO
What you do is take a paper from your school stating you stopped studying on xxx date (the date your extension expires) go to the immigration office, cancel this current extension and then you will automatically go on amnesty until no longer than the 31st of July.
You CANNOT just let your extension run out, as that will not let you switch over to the amnesty you need to go cancel it