And how to you come to that conclusion that public school kids are inferior to private school kids? All 3 of my children went to public elementary, middle and high schools. I might add that all 3 went to a public university, graduated with Bachelor’s degrees, and all 3 are gainfully employed. Lest you make some comment about how things are different now than in the past (even though HS was only 6 years ago for my youngest), I am a Scoutmaster in a Boy Scout Troop, sop I have access to Middle and High Schooler age children. I would say that roughly 2/3 of our Troop are in public school (others are in Charter Schools, or home-schooled). I don’t see a large difference in education between them.
There are good and bad public schools, just are there are good and bad private schools. Don’t make blanket judgements based on just one kid (your niece).