The WMC has four rounds to it to determine a world champion in mathematics and to rank the top 50 students in the world. Problems are from basic math up to introductory calculus. The working language is English.
Each individual nation has its own open examination. The top 20 scorers on this open exam qualify for the national finals, a test that is standardized world wide. The top 20 scorers of each nation's open exam takes the national finals exam, and all who pass with a certain set score are allowed to compete internationally. This round is often called the world qualifiers. Then, those who qualify take the international test, which is the same for all competitors. This round helps to rank students as well as eliminate most of them. The top 3 scorers from each country make up the country's total score, and countries are usually very competitive about this round. The top 100 scorer from this round is allowed to travel to the championship university to try and win a individual world title as well as a title for their country.
Rankings are determined by the competitor's scores on the tests of round 3 and 4 relative to other scorers. Each test is worth 1000 points, and the championship round is weighted at 1.25. So the world ranking score is equal to international score + championship score x 1.25.
Round 3: International Champions (Top 5)
Individuals Score (Country):
Round 4: Championship Round (Top 5)
Individual Score (Country)