@SouthOCGal It’s not subject-based or STEM-oriented. Course offerings vary by site and session. Actually, CTY has an intensive studies and an academic explorations program; the former requires a higher SAT score to get into. You can find the course offerings for each program on the website.
Just from looking at the course list, I think it’d be hard to find a non-economics-focused math course unless your son has already taken algebra/is taking algebra this year. I’ve only been looking at it for a few seconds. I’m sorry I can’t be more helpful; I’ve always been more of a humanities/social sciences student. 