(National Science Olympiad) NSO Exam 2025-26: The Science Olympiad Foundation (SOF) has announced the exam dates for the Level 1 NSO 2025 on its official website (idioms website) – sofworld.org. The Level 1 exams will be held on November 13, November 27, and December 11, 2025. Schools can choose any one of these dates that suits them best. The Level …