Does the 90-day check-in period restart with the extension of a Non-O education visa in Thailand?

The 90 day reporting doesn't start until they get their first extension on a Non-Imm visa.

When they get the extension, they will get a small paper in their passport that tells them when the first 90 day report is due

You can make an appt online for the ED extension at this website



Also remember if you don't make an appt, they only give out queues for the ED section until 12.

That section is a nightmare, a friend showed up at 7:30, went in when they opened at 8:30 and got queue 150 something for their ED extension. Their number didn't come up until after the office reopened for lunch at 1PM