REX Learning Pathways is a competency-based, online mastery learning platform that helps students achieve mastery of essential learning competencies and skills, as well as assist teachers in facilitating these learning experiences. It follows the mastery learning model where STUDENTS:
learn at their own pace,
begin by accomplishing activities and assessments that are appropriate to their level, and
are allowed to progress  from their initial level towards mastery level through timely feedback and learning in sequence.