Brooklyn schooling is confusing. There are lots of rumors flying around the playground and they all sound crazy. This talk explains what happens and when and gives you a general overview of public and private school culture in Brooklyn. There are also a lot of details about preschool in this talk. It is designed for the parents of babies and toddlers.
If you want details on Universal Prek or Public Kindergaten (and the big picture for public specifically) the Intro to Public School talk is the one you want.