Haven't been connected for decades,late 50s-early 60s. Worth noting that the "Queens College Grammar School" stayed open while Queens College was closed in the early 1800s for financial reasons.
Also worth noting that William Leggett, who many of you know was the Rutgers captain in the first football game, was on the Rutgers Prep faculty at the time, and many Prep grads were on the team. So back when we were a small, private school and there was a connection to the prep school, many students did go from one to the other. (And Prep had female graduates about 80 years before the college did.)
And, of course, Prep also celebrated its 250th anniversary last year.