(a) Public school districts that have received corrective action reimbursement or grants pursuant to this Act shall cooperate fully with the Attorney General in litigation to recover costs of corrective action. The Attorney General may, in his discretion, take exclusive charge of such litigation. Any amounts recovered, less costs of litigation, shall be divided pro rata between the grantee public school district and the Asbestos Abatement Fund, based upon the percentage of costs of corrective action borne by the State and the school district, respectively.(b) Any nonpublic school which has received a grant or reimbursement pursuant to this Act, and which subsequently recovers costs of corrective action through litigation, shall reimburse the State from such recovery. The percentage of the recovery reimbursed to the State shall equal the percentage of costs of corrective action initially borne by the State. All reimbursements paid to the State under this subsection shall be deposited in the Asbestos Abatement Fund.