All international students are required to report themselves to the Immigration Office every 90 days.
The first 90-day reporting for new international students with new single-entry visa will be done automatically at the same time during the first visa extension at the Immigration Office.

However, students are responsible for filing their next 90-day reporting.

The 90-day reporting can be done by the following 2 ways:

In person: You can do the 90-day reporting 7 days before the due date to 7 days after the due date at Phuket Town Immigration Office at Room 101 or the drive-thru service. Please bring your passport with you.

Online: You can use the online reporting only if you have reported yourself in person at the Immigration Office at least once before.
You can report yourself online from 15 days before the due date to the actual due date.

WARNING: Fine for late reporting is 2,000 baht or 5,000 baht if you get arrested. It is your own responsibility to report yourself to the Immigration Office. IAC shall not be held responsible or liable for any fees incurred due to your negligence.

For online, please visit: 
https://tm47.immigration.go.th/tm47/#/login