, You can apply for an extension from 45 days before until the very last day on your current stamp. A minimum of 15 days before is a requirement for an initial in-country visa application, not for an extension.
You have to go to the immigration office that issued your extension to cancel current exntension based on studying before you head to a land border. Some land border check points don't let you leave Thailand with uncanceled extension based on studying.
Then you will be able to enter Thialand on visa-exempt or tourist visa depending on your nationality.
No rule on maximum stay in Thailand regarding only immigration regulations.
, what i'd like to know is how the landlord/property owner (could be a foreigner, but in most cases Thai) can fill TM47 form. I don't mean I doubt you did.
, don't you mix TM47 with TM30 or other form, such as TM28 or any? TM47 is 90 days report, and it's supposed to be submitted every 90 days, "years ago" doesn't work for TM47.
, Why is TM47 from the owner of the property? TM47 is a form for a 90-day report, it's supposed to be prepared by a foreign applicant. Never heard that a 90-day report requires anything from the property owner other than a TM30 receipt.
, Brandon corrected, because extension and visa are different. Extension should be transferred when you get a new passport while visa itself cannot be transferred to a new passport. That’s why different measures are applied when you get a new passport.