This study examines the impact of Information and Communication Technology (ICT) integration on educational achievement using Structural Equation Modeling (SEM). It investigates how teacher readiness, student engagement, and institutional support mediate the relationship between ICT integration and academic performance. Data were collected from 370 students and 48 teachers across five high schools with varying levels of ICT adoption. The SEM analysis revealed that ICT integration, directly and indirectly, influences educational achievement through enhanced teacher readiness and student engagement. Institutional support was crucial in facilitating effective ICT integration and improving educational outcomes. These findings highlight the importance of comprehensive support systems, teacher training, and engaging learning environments in maximizing the benefits of ICT in education. The study provides practical implications for educators and policymakers aiming to optimize school technology use.