Find a driving school they should take care of all paperwork needed including the medical. My Thai missus paid 5,500 baht 20hrs of training, their duel controlled car. They pass you then take you to the center to collect the license, unlike the government test center, you can keep trying ALL day till you pass.
This was at Chantharburi though, excellent service no rip offs. They even test you on an open road. 2days training & took test a few days after.