What is the process of visa extension?

There are two types of student visa you can apply for: single entry or multiple entry. The single entry visa allows you to stay in Thailand for 3 months only. It needs to be extended within 3 months (before expiration). The multiple entry visa allows you to stay in Thailand for maximum 1 year. However, you still need to report back to the immigration center in order to re-activate the visa every 90 days (to confirm that you are still living in Chiang Mai). The multiple entry visa will be automatically re-activated when you re-enter Thailand. In this case there’s no need to report back to the immigration center. Multiple entry visa is recommended for students who want to travel to other countries during their free time and re-enter Thailand.