This is a bit of a long shot, but when considering colleges, look into the College of Creative Studies at University of California, Santa Barbara, “A Graduate School for Undergraduates.” They have a math program. All of the CCS programs are VERY selective. Students can go directly into grad-level research/work in their freshman year. Contact with top faculty. Enormous academic freedom in how they chose spend their undergrad years. Yes, it’s a public school and UCs in particular don’t give FA to non-residents. BUT THEY STILL GIVE MERIT AID to nonresidents. Maybe your son can be one of them?