“Development of a Four-Tier Test (FTT) in the Form of a Virtualization Static Fluid Test (VSFT) Using Rasch Model Analysis to Support Learning During the COVID-19 Pandemic”. Journal of Education for Sustainability and Transformation 1, no. 1 (September 11, 2025). Accessed October 17, 2026. https://journal.serral.org/jestra/article/view/8.