What study shows that private school children are the "highest-achieving"?
Oh, come on, that's not a secret.
Since teachers are quite opposed to actual testing in schools, we rely on the Fraser Institute to put together the only comparative testing we do.
The Fraser Institute found that private or independent schools scored an overall average of 8.5 out of 10 over the last five years while public schools earned a 5.9 overall average. In the 2010-2011 school year, 62 of the top 100-performing schools were private schools, according to the report card. The top 14 schools tied for first place, scoring 10 out of 10. Of those top 14, 12 were private schools and two were public schools.
http://www.ourkids.n...-schools-19364/
And as much as y people want to run down the FI, there is not much they can do to skew the numbers here, they are very clear.