Mississippi Code Title 37. Education § 37-21-11

(1) There is hereby established the “Kindergarten Readiness Assessment Program,” authorizing the Mississippi Department of Education to establish a common statewide Kindergarten readiness assessment, the purpose of which is to provide teachers, administrators and parents baseline data on students at the beginning of their Kindergarten year. It is the intent of the Legislature, in establishing this program, to ensure that the Mississippi Department of Education shall:

(2) The Kindergarten readiness assessment may be given prior to the beginning of Kindergarten or during the first thirty (30) days of the Kindergarten year.