Intharaksa P. Development of a Supplementary Curriculum Based on Metacognition and Context-Based Learning to Enhance 21st-Century Learners’ Competencies in Schools under the Sakon Nakhon Secondary Educational Service Area Office. J.Grad Res [internet]. 2026 Jul. 16 [cited 2026 Sep. 29];17(2):JGR-17. available from: https://so02.tci-thaijo.org/index.php/banditvijai/article/view/281381