Do I need to cancel my ED visa extension before obtaining a tourist visa in Thailand?

The user is seeking advice on transitioning from an ED (Education) visa to a tourist visa while having two passports—one full and one empty. They inquire if it is necessary to cancel the last extension of their ED visa and how to travel using both passports. Community responses advise that the user must secure a cancellation letter from their school, which is required to officially cancel the extension at the immigration office. Additionally, they must be mindful that switching passports is only permissible when flying out of the country, and not when crossing at Nong Khai.