According to Envision, the organization that is collaborating with George Mason Uni for GYLC. People are selected based on outstanding performance in the SAT and contact details are obtained from the College Board
Usually someone nominates you or if you took a standardized test then they check information from that.
Cannot be that my son’s name was chosen from an SAT test score, he hasn’t take his SAT yet. We went to a Fulbright College Fair in London. My guess is that when he gave GMU his info, they sold the list. NOT impressed.