<p>The International Junior Science Olympiad (IJSO) is an annual individual and team competition in the Natural Sciences for students who are under sixteen years old on 31 December of the competition year. IJSO combines Physics, Chemistry, and Biology in integrated theory and experimental rounds and is held in a different host country each year.</p><ul><li>Eligibility: students under 16 on 31 December of the competition year.</li><li>Competition structure: integrated theory and experimental rounds across Physics, Chemistry, and Biology.</li><li>Awards: Gold, Silver, and Bronze medals, with certificates of participation for all competitors.</li><li>Singapore participation is via national team selection coordinated with schools and the Ministry of Education; travel and accommodation for selected team members are covered.</li><li>The international round is typically held in December; IJSO-2025 was hosted by Russia, and subsequent host countries are announced on the official IJSO website.</li></ul><p>Students interested in representing Singapore should speak to their science teachers about the national selection pathway.</p>