The objectives of the studies were designed to determine the increase of teacher competencies in implementing differentiated learning by Tuntas Method (peer teaching method in learning community). The studies were school action research of SMAN 1 Parakan in 2022 with the subjects were all the teachers and carried out by establishing of learning communities and Tuntas method assistance. The results showed that Tuntas method was effectively used to increase teacher’s competencies in the implementation of differentiated learning. The action of strategies was used in the Tuntas method based on adult learning principles, such as independent, collegial, and collaborative.
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