In 1921, there was an Elementary Education Act. Thammakarn Monthon established the Provincial Teacher Training School in 1925. It was located in Tumbol Thachamuang, Kamphaeng phet District (Rattaphum District now), Songkhla Province. It was named at that time “Krumoon Training School” (Songkhla College of Agriculture and Technology now). The school was for students with a Matthayom 3 certificate or the teachers from various districts and provinces. The students studied there for two years and then acquired the Krumoon Professional Certificate.