What selection criteria would you recommend for early indicator of ability than high school? I agree that everyone should get opportunities regardless of affor

What selection criteria would you recommend for early indicator of ability than high school? I agree that everyone should get opportunities regardless of affordability (ex: international talent), but having non-intelligent agents in control by gaming the system is very dangerous (as seen in politics). I think ethics matter more in the long run, maybe that should be a factor for university screening. We have too many intelligent people doing harm in the world (ex: ad business)