K-12 international schools in China offer diverse competitions: Math Olympiads (AMC, IMO), Science Olympiads (biology, chemistry, physics), AI/robotics (WRO, VEX, FIRST), debate (WSDC, MUN), business (DECA, Young Enterprise), and STEAM challenges. These contests develop critical thinking, problem-solving, and global competencies, preparing students for university admissions and future careers through hands-on learning and international recognition.