Highly anecdotal, but from my mother's side of the family, she and her cousin passed, went to grammar school, moved from area, went to uni, etc. Siblings and ot

Highly anecdotal, but from my mother's side of the family, she and her cousin passed, went to grammar school, moved from area, went to uni, etc. Siblings and other cousins didn't, and still in area - one went straight into the navy, so did well long-term with oil, and one married to air force officer (again then oil worker), but the rest are substantially less well-off. From talking to family friends over the years, a marked impact upon life outcomes seems to have been a fairly common result of that single test. How much of that is because of ability/drive etc and would have occurred anyway is debatable, but it pretty horrendous placing that much weight upon a child so young