An inside player who helped negotiate an unusual admissions policy at an elementary school in fast-changing Sunset Park, Brooklyn lifts the curtain on the process behind the policy that will set aside more than a third of the Kindergarten seats for poor and immigrant students.

A parent argues against the city’s proposal to re-draw the lines for elementary schools in Park Slope, Brooklyn. She says it causes more problems than it solves.

Kindergarten admissions for public schools start this week, as parents begin touring elementary schools. Several districts have had to put children on wait lists in recent years because of demographic changes. Parents of kindergarteners can also expect a more demanding curriculum for their children that is being introduced by the city.