Approximately thirty students are selected based on their USAMO performance to be trained at the Mathematical Olympiad Summer Program, or MOSP (better known as MOP to its participants). Approximately 12 of the top USAJMO scorers are invited as well. Unless qualifying for a particularly high level, all students must be in 9th grade or higher to be admitted into MOSP, and high school seniors are admitted only if they are members of that year's IMO team.