Principal Instructional Leadership and School Well Being as Predictors of Students Learning Readiness in Implementing Five-Day School Policy. Objectives: This study aims to examine the influence of principal instructional leadership and school well-being on students' learning readiness in the context of implementing the five-day school policy in senior high schools. Methods: The study employed a quantitative approach with a correlational design. A total of 125 students from senior high schools in Banyumas Regency were selected using purposive sampling. Data were collected through validated questionnaires measuring instructional leadership, school well-being, and learning readiness. Statistical analysis was conducted using multiple linear regression with SPSS 24.0. Findings: The results indicate that principal instructional leadership has no significant effect on students' learning readiness (t = 0.304; p = 0.762). In contrast, school well-being has a significant positive influence (t = 4.054; p = Conclusion: The findings suggest that school well-being plays a more substantial role in supporting students’ learning readiness than principal instructional leadership within the implementation of the five-day school policy. Efforts to enhance student well-being should be prioritized in policy execution and school leadership practices. Keywords: five-day school policy, instructional leadership, learning readiness, school well-being.
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