Ohio Rev. Code Ann. § 3301.0715
(A) Except as required under division (B)(1) of section 3313.608 or as specified in division (D)(3) of section 3301.079 of the Revised Code, the board of education of each city, local, and exempted village school district shall administer each applicable diagnostic assessment developed and provided to the district in accordance with section 3301.079 of the Revised Code to the following:
(F) Beginning in the 2018-2019 school year, any chartered nonpublic school may elect to administer the kindergarten readiness assessment to all kindergarten students enrolled in the school. If the school so elects, the chief administrator of the school shall notify the superintendent of public instruction not later than the thirty-first day of March prior to any school year in which the school will administer the assessment. The department shall furnish the assessment to the school at no cost to the school. In administering the assessment, the school shall do all of the following: