UK Chemistry Olympiad by RSC
- Past Papers of Round 1 (2003-2019)
- Five long questions in two hours including one organic scheme, which is harder than that in USNCO national exam part ii;
- The general difficulty is similar to part ii except more integrated organic chemistry and more calculations.
Austrian Chemistry Olympiad
- Past Papers of National Competition (2006-2019)
- Six to eight super long questions in five hours including two to three integrated organic problems, which represents 30-40% of the total points;
- The general difficulty is harder than USNCO national exam part ii, which can be used good preparatory problems for study camp.
- The scheme-based organic problems are good for students who finish reading the textbook and also practicing end-of-chapter problems to achieve mastery.
German Chemistry Olympiad
- Past Papers of National Competition Round 1-4 (2003-2015, 2016 and 2016 in German)
- A four-round competition, the first two rounds are for students to work at home;
- The top 60 of the participants of the 2nd round are invited to the 3rd round, a one-week chemistry camp;
- The top 15 of the 3rd round are the participants of the 4th round, a one-week practical training, IChO style problems in both theoretical and practical parts.
International Chemistry Olympiad (IChO) IChO Results, IChO Steering Committee (A Google Site website), A short history of IChO,
IChO Preparatory Problems
International Mendeleev Chemistry Olympiad (in Russian)
- Past Paper of Tour 1&2 (1997-2013 in Russian, 2014, 2015, 2016, 2017, 2018 (no test paper), and 2019 in English)
- Three tours (rounds), the first two are theoretical, the last one is lab practical;
- Eight IChO-style free response questions in tour 1 in five hours;
- Five areas (inorganic, organic, physical, analytical, biochemistry) in tour2, student choose one problem to solve out of three in each area in five hours;
Chinese Chemistry Olympiad (website down)
- Past Papers of the Preliminary (Province Level) Exams (2007-2019 in Chinese, will translate in future)
- The local level in China, 8 to 10 IChO-style free response questions in three hours;
- Not a standard test, which means the style and difficulty varies every year;
- Complicated calculation and super hard integrated organic problems;
- The national exam test papers are not officially released, which is even harder than the province-level exam;
Japanese Chemistry Olympiad
Indian Chemistry Olympiad
Cambridge Chemistry Challenge
Canada Chemistry Contest (selection for Canada Chemistry Olympiad)
Canada Chemistry Olympiad
Australian Chemistry Olympiad
Baltic Chemistry Competition (online, 2016-2019)
ChemiCo
Every Ashdown Exam by North Eastern ACS Section
Baltic Chemistry Olympiad
- Past Papers (1993-2019, starting from 2000, most of theoretical test papers are available in English)
Taiwan Chemistry Olympiad
Italian National Chemistry Olympiad
Singapore Chemistry Olympiad
France Chemistry Olympiad