The official rules for extending any type of visa, such as non-O, non-B, visa and education visas are written in the next documents:
These documents can be downloaded at the website of the Immigration Bureau.ORDER OF THE ROYAL THAI POLICE No. 777/2551 Subject: Criteria and Conditions for Consideration of an Alienís Application for a Temporary Stay in the Kingdom of Thailand
ORDER OF THE IMMIGRATION BUREAU No. 305/2551 Subjext: List of Supporting Documents for Consideration of an Alienís Application for a Temporary Stay in the Kingdom of Thailand
Translated by Tilleke & Gibbins. Revised by Legal Div. Royal Thai Police Headquarters ©2009 Tilleke & Gibbins International Ltd. All rights reserved.