The screening tournament

The tournament of geniuses was about to be held but before that, there was a screening process. Each school in one region will send out five representatives, even individuals who don't go to any school can join as long as they are under twenty. The five strongest within the region will be chosen to represent their respective regions and once again fight for the position to be allowed to join the tournament of geniuses. After the competition, the ten strongest under twenty will represent the country to face the genius of other countries.