However, here are two additional factors that you must promise me never to mention out loud in the state staffroom...
Firstly their teachers tend on average to be better academically qualified in the subjects they teach than their state counterparts and they haven't all had their heads filled with nonsense on a PGCE course. The standard retort that they wouldn't last five minutes in a tough inner city comp is also true however.
Secondly private schools still teach in a fairly traditional fashion and insist on a high standard of discipline, which funnily enough leads to success, both academically and in employment. In the state sector however, we have embraced every fashion, fad and barking lunacy with an enthusiasm which makes me want to hold my head in my hands and weep tears of despair. (Group work, discussion, peer review, poster making, self expression and varied mediums of learning spring to mind, but these are only the tip of the iceberg). Why not just mix up a random selection of words and invent the next one yourself.
See, I told you not to mention them.