Purba, B.E., Sinaga, J.A.B. and Simarmata, G. 2026. The impact of the five-day school policy on the psychological aspects of students, social development and learning motivation of class XI high school students in Pematangsiantar City. EDUCTUM: Journal Research. 5, 2 (Mar. 2026), 237–243. DOI:https://doi.org/10.56495/ejr.v5i2.1543.