What documents do I need to cancel my work permit and visa extension in Thailand?

To cancel your work permit and visa extension in Thailand, you will need to gather specific documents from your employer, including a letter stating your last day of employment. Additionally, the Ministry of Labour may require further documents such as a copy of the Thai company registry, a power of attorney, and a specific form provided by them. It's essential to cancel your work permit first before applying for a new visa using documents from your school, as you cannot apply for a new visa at a Thai consulate until after these processes are completed.