Early Warning, Grade Prediction, and Teacher-Facing LLM-Ready Explanations Toward an Open Volleyball Course: Reproducible Evidence from Four Public Education Datasets. JTIE [Internet]. 2026 Jun. 17 [cited 2026 Jun. 23];5(2):20-44. Available from: https://jtie.stekom.ac.id/index.php/jtie/article/view/525