The competition is organized in three rounds, each round lasting 5 hours. In the first round, students take a theory test consisting of 8 questions, each worth 10 points. The maximum score for round one is 80 points.
The second round of theoretical exams includes 5 fields (physical chemistry, inorganic chemistry, organic chemistry, analytical chemistry, life chemistry and polymers), each field has 3 questions. Students will choose one question in each field to work on. The score for each question is 15 points. The maximum score in round two is 75 points.
In round 3, students take a lab practical exam that usually consists of 3 parts, each part worth 25 points. The maximum score for the practice round is 75 points.

Files coming soon.
Dr. Chen am looking for a staff member for my USNCO mentorship program (details at https://dcho.us/) to lead 2–3 one-hour problem-solving sessions per week for students preparing for various-level USNCO exams; sessions are held over Zoom on weekends. College students with a strong USNCO background are preferred. If you’re interested, please email Dr. Chen at chen@dcho.us with questions or a brief résumé. The hourly rate is competitive and depends on the candidate’s credentials.
Dr. Chen
Founder and Lead Coach, Dr. Chen’s Academy
chen@dcho.us | https://dcho.us/