The only paper I've read on this (and I unfortunately can't find it) suggested that students who go to pre-school, as opposed to those who go straight to kindergarten, have a higher rate of behavioral problems. Of course, that's for ALL pre-schools.
The only other information I have is that a lot of these nurseries use tests (like "put the block in the right hole") as part of their admittance exams, and high performance those tests show absolutely no correlation with later success. (Obviously kids who do very poorly might have other issues) That's from NutureShock.
And finally, in New York City these "top" nursery schools are considered feeder schools to the "top" elementary schools, and so on, so regardless of whether the kids in them have been better educated, they might gain an admission advantage to private high schools and consequently university. See the movie "Nursery University." (That's not actually a recommendation, it was completely painful.)
The only other information I have is that a lot of these nurseries use tests (like "put the block in the right hole") as part of their admittance exams, and high performance those tests show absolutely no correlation with later success. (Obviously kids who do very poorly might have other issues) That's from NutureShock.
And finally, in New York City these "top" nursery schools are considered feeder schools to the "top" elementary schools, and so on, so regardless of whether the kids in them have been better educated, they might gain an admission advantage to private high schools and consequently university. See the movie "Nursery University." (That's not actually a recommendation, it was completely painful.)