A lot of the private schools nationwide are going along with Common Core. The Catholic schools certainly have, and many others as well. SAT & ACT are aligned with the Common Core standards & curriculum. Many private schools feel that they must do it or their students will not do well on the national tests.
I don’t know of a single Private School, Brentwood, Bel-Air... anywhere on the west side that subscribes to Commie Core.
My sister-in-law’s Catholic school wants nothing to do with it.