The stationery shop near us knows the class 4 projects before we do

My daughter came home on Friday and told me she needed "something for science" by Tuesday and could not remember what. I went to the small stationery shop near our gate in Bachupally, and before I could explain, the owner handed me a sheet of green chart paper, a packet of cotton and a glue stick. "Class 4, leaf project," he said. He was right. I don't know how he knows, but I have stopped asking the class group and started asking him.