This session, designed for teachers, educational administrators, policymakers, and researchers, presents the Seoul Metropolitan Office of Education (SMOE)’s newly developed digital diagnostic system for strengthening student competencies. The presentation outlines how SMOE builds data-driven assessments, integrates them with an AI-based teaching and learning platform, and implements them across schools. Learn how diagnostics in literacy, numeracy, and related areas support real-world competency development and enable more equitable, evidence-based educational decision-making.