Balleras J, Yippikun C, Castro R, Prasertsak A. Developing a Standardized English Proficiency Test Based on the CEFR and Language Test Development Manual : (in progress). JEL [internet]. 2025 Aug. 16 [cited 2025 Aug. 24];6(2):169-8. available from: https://so17.tci-thaijo.org/index.php/JEL/article/view/1007