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Research has long linked early childhood education to later academic success and suggested it may be a critical part of closing the persistent academic disparities between student groups. This report found that HISD students who received two years of pre-K education had a greater likelihood of school readiness than those who only got one. At the same time, however, the vast majority of students in the district’s pre-K program – 90 percent of them – were only enrolled for one year. It also found that many students, whether they attended pre-K with the district or not, were still not ready for kindergarten by the time they got there.