What's currently happening in the NYC public school system is that Mayor Bloomberg -- in his dictatorial, unrealistic business approach to education -- won't take failure as an option. Ever. The school had better show improvement or it's shut down. If a student fails to learn, it's always the teacher's fault because she/he didn't find the right way to address that particular student's individual/unique learning style (easy enough to do in a class of 35-40 kids, right?) So we have what's called "differentiated instruction," which basically means (when you clear away all the BS), if a student can't pass a test, give him/her an easier test.
The students know this, so there's no sense of ownership in their work, and they still fail. So since everything is always the teacher's fault, there's a lot of score fudging to keep a school open.
In effect, King Bloomberg (who already bought extended term limits, which he initially opposed years ago) is pulling the biggest scam in the history of NYC public education. To those who would disagree, I suggest they contact the local colleges and ask why freshman year remedial courses are more prominent than ever.
Education in NYC has become a farce...and a longer school day ain't gonna fix it.
(BTW, Bloomberg recently shortened the school year by a few days -- a few days he added a couple years back, to "improve" education -- as one way of baiting teachers to vote for him).