The Adaptive Concept Mastery System (ACMS) is a digital learning tool designed to ensure mastery of concepts through adaptive flashcards and quizzes. It features an adaptive learning loop: after reviewing concept cards, users take mini-quizzes, and if they make more than two errors, the system immediately guides them to review mistake-prone cards, creating a focused remedial cycle. All concepts are stored in a Concept Pool, enabling users to generate customized tests at any time, while personalized analytics show which concepts were missed and how often, helping learners target their weak points. ACMS enhances digital education by offering a personalized, self-paced learning path that emphasizes active recall and ensures mastery before moving on, preventing knowledge gaps. Success is measured through the Concept Mastery Rate, tracking the percentage of concepts moving from 'Mistake-Prone' to 'Mastered,' and usage metrics, monitoring user retention and the number of remedial review.