This study aims to capture the best practices, successes, challenges, lessons learned of the design and development of the Technology for Education Systems Transformation (TEST) project implemented by World Education Cambodia. The study also illustrates the significance of putting users at the core of project design, developing prototypes to test with iterative process, deploying the solution, and scaling it to reach more beneficiaries. In addition, the case study provides a comprehensive process of using human centered design method and recommendations for development practitioners who are interested to design ICT for education project in Cambodia.