Witsanu Supandee; Chitphon Yachulawetkunakorn. EFFECTS OF HIGH SCHOOL–LED CAMP ON ELEMENTARY STUDENTS’ SCIENCE LEARNING MOTIVATION: A PRETEST–POSTTEST STUDY: Received: 02nd March 2026, Revised: 09th April 2026, 12th May 2026, Accepted: 24th July 2026, Date of Publication: 31st July 2026. pijss 2026, 12, 53-65.