This study investigates the effectiveness of an integrated approach combining think-pair share and active learning management in enhancing non-credentialed teachers' assessment competency and compares their learning achievement in educational assessment across pre, post, and delayed examination phases. Utilizing a one-group experimental design, 29 participants were selected through cluster sampling. Instruments included an integrated think-pair-share and active learning management system, along with assessments evaluating participants' assessment knowledge, skills, and attributes. Data analysis involved mean scores, standard deviation, effectiveness index (E[subscript 1]/E[subscript 2]), One - way repeated measure ANOVA, and pairwise comparisons. Results indicate that the integrated learning management plan effectively facilitated teaching assessment competency to non-credentialed teachers at the graduate level, leading to the attainment of expected learning levels within the class. Additionally, it significantly enhanced participants' competency compared to their baseline levels, with sustained effectiveness demonstrated over time.