In-school selection can select students with strong mathematical, programming and modeling skills from many contestants, thus representing the school in provincial competitions. Selection methods usually vary from school to school. Some schools may arrange mock competitions, lectures and other activities in their spare time to help students improve their modeling ability and competition skills, and also select outstanding players to participate in provincial competitions on behalf of the school.

The selection of schools and provincial competitions are very challenging, and students need to be fully prepared before the competition, including improving their abilities in mathematics, programming and data processing.