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This forum is open to anyone interested in the U.S. National Chemistry Olympiad (USNCO). Please feel free to share your favorite resources, ask questions of our volunteers, or share comments/suggestions for annotated solution guides in the relevant forums. You only need an ACS ID to login and join the conversation (a member number is not required).

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Hi! My name is Yitian, and I am a gold medalist from the 2021 IChO hosted by Japan. Here’s some of the free resources I found helpful: 


This is a student-run organization committed to helping people study. Previous Study Camp and IChO participants write Mock Exams of all levels, and they host informal mock tournaments. I found their practice tests and tournaments the most helpful. 

Edward’s and Anugrah’s websites:  , 

These websites contain practice exams and resources created by my great friends Edward and Anugrah. They were IChO gold medalists as well and were mentors at the study camp in 2021.



I have just found out about USNCO and i'm in 9th grade and I was wondering if USNCO is aimed mainly towards highschoolers closer to the end of highschool (in terms of difficulty) because I also have recently looked through the practice exams (from earlier years) and found it quite difficult (although I managed to try some out and got them correct).