Even though the state has required developmental screening for pre-K students for years, parents are confused as to why the city has just begun to enforce it. Developmental screening for subsidized and public preschool programs is supposed to identify children who may need extra help, but parents and teachers think the tests come too early. "I don't think the test can give an accurate picture of where a child is," teacher Crystal Salas told the Daily News. The test requires toddlers to play with blocks, draw pictures and identify shapes and colors. Can't they just give the kids the marshmallow test and call it a day?