SPRINGFIELD, Ill. (WAND) - A new study by the Illinois Department of Education shows less than a quarter of students are ready for kindergarten.    The study was based on teachers' evaluations of their kindergarten students. The study analyzed the students for the first 40 days of school for social and emotional development, reading and language skills and math skills. Roughly 106,000 students were included in the study.    The data show that about 42 percent ...