Adaptive learning systems have emerged as a transformative approach in K-12 education, promising to personalize learning experiences and improve educational outcomes. This paper aims to assess the effectiveness of these systems in enhancing student learning, engagement, and achievement by focusing on their integration in various K-12 settings and examining both quantitative and qualitative outcomes. Adaptive learning systems utilize datadriven algorithms to tailor educational content to the individual needs of students, providing personalized learning paths that adapt in real-time based on student performance and engagement. These systems are designed to address diverse learning styles, paces, and abilities, potentially closing educational gaps and promoting equity in learning. The primary objectives of this study are to evaluate the impact of adaptive learning systems on student achievement in core subjects such as mathematics, science, and reading; to assess changes in student engagement and motivation resulting from the use of adaptive learning technologies; and to identify best practices and challenges associated with the implementation of adaptive learning systems in K-12 classrooms. A mixed-methods approach was employed to provide a comprehensive evaluation, combining a quasi-experimental design with control and treatment groups across multiple schools for the quantitative component, and surveys, interviews, and classroom observations for the qualitative component. Quantitative data included pre- and post-tests, standardized test scores, and attendance records to measure academic achievement and engagement levels, while qualitative data provided insights from students, teachers, and administrators regarding their experiences with adaptive learning technologies. The study found significant improvements in student achievement in schools that implemented adaptive learning systems, with students demonstrating higher gains in test scores compared to their peers in control groups. The personalized nature of adaptive learning helped struggling students catch up with their peers, particularly in mathematics and reading. Additionally, students reported increased engagement and motivation, attributing their interest to the interactive and tailored learning experiences provided by adaptive technologies. Teachers noted that adaptive learning systems facilitated differentiated instruction, allowing them to cater to individual student needs more effectively. However, challenges such as initial setup costs, the need for ongoing professional development, and varying levels of technology access were identified. Successful implementation was closely tied to strong support from school leadership and sufficient training for educators. The findings suggest that adaptive learning systems hold considerable promise for enhancing educational outcomes in K-12 settings. The ability of these systems to provide real-time feedback and personalized learning paths can significantly benefit students, particularly those who require additional support. However, the effectiveness of these systems is contingent upon proper implementation, including adequate training for teachers and equitable access to technology for all students. The study highlights the importance of addressing the digital divide to ensure that all students can benefit from adaptive learning technologies. Future research should explore long-term impacts, including the sustainability of academic gains and the potential for adaptive learning systems to foster lifelong learning skills. Adaptive learning systems have demonstrated their potential to transform K-12 education by personalizing learning experiences and improving student outcomes.