The high ranking public schools in Maryland are all in Montgomery County. Baltimore County has 1 or 2 high schools that rank above avg and the rest are average at best. You need to stop massaging the stats to try and prove your ill advised argument.
An ill-advised argument is one not supported by facts, for example - "private schools are better because they are" - which is all we've really heard. I have merely pointed out that there are many sources of information that refute that, that's not massaging, it's saying "look, there, go see for yourself".