(1) Provision of amounts for assistance (A) In general The Secretary of Education shall provide amounts to the Secretary of the Interior to meet the need for assistance for the education of children with disabilities on reservations aged 5 to 21, inclusive, enrolled in elementary schools and secondary schools for Indian children operated or funded by the Secretary of the Interior. The amount of such payment for any fiscal year shall be equal to 80 percent of the amount allotted under subsection (b)(2) for that fiscal year. Of the amount described in the preceding sentence— (i) 80 percent shall be allocated to such schools by July 1 of that fiscal year; and (ii) 20 percent shall be allocated to such schools by September 30 of that fiscal year. (B) Calculation of number of children In the case of Indian students aged 3 to 5, inclusive, who are enrolled in programs affiliated with the Bureau of Indian Affairs (referred to in this subsection as the “BIA”) schools and that are required by the States in which such schools are located to attain or maintain State accreditation, and which schools have such accreditation prior to October 7, 1991 , the school shall be allowed to count those children for the purpose of distribution of the funds provided under this paragraph to the Secretary of the Interior. The Secretary of the Interior shall be responsible for meeting all of the requirements of this subchapter for those children, in accordance with paragraph (2). (C) Additional requirement With respect to all other children aged 3 to 21, inclusive, on reservations, the State educational agency shall be responsible for ensuring that all of the requirements of this subchapter are implemented.