Khattiyasuwan, S., Jankaew, W., & Srisatanon, P. . (2021). Results of the Ordinary National Educational Test (O-NET) in the Academic Year 2019 of Grade 6 Students in Schools under Office of the Private Education Commission in Bangkok Metropolis. Rajapark Journal, 15(39), 262–279. Retrieved from https://so05.tci-thaijo.org/index.php/RJPJ/article/view/250363