I also did my 5yr renewal yesterday, appointment 14:30 out 15:40, easy.
copy front and back old license.
copy passport id page, visa extension, entry stamp.
medical certificate.
residence letter from jomtien.
Do the online training video; have to watch all as there are questions during the video ( they are easy ).
When it's finished it will show a page with QR code, you have to print out the page and include with documents. I took a photo with my phone and had it printed across the street from the DLT offices. https://www.dlt-elearning.com/
https://pcec.club/Thai-Driving-License
The only tests were colour, guy had controller and lit up traffic sign and you told him the colour, then reaction test, press accelerator and when red light comes on press brake pedal, both very easy.
Hope this helps.
