Cutamora, M. 2026. Predictive Influence of Teacher Challenges and School Head Support on Teaching Effectiveness in Multigrade Classrooms in Lingig I District, Division of Surigao Del Sur: A Descriptive-Correlational Study. International Journal of Education, Research, and Innovation Perspectives. 2, 2 (Feb. 2026), 30–60. DOI:https://doi.org/10.5281/zenodo.18475572.