The document summarizes key changes made in the revised Implementing Rules and Regulations (IRR) of the Adopt-a-School Program Law. It outlines revisions made to definitions of terms, procedures for school participation, claiming of tax deductions and incentives, administration of the program, and roles of the coordinating council and secretariat. Priorities are given to schools in poorest provinces, low-income municipalities, and those with classroom shortages or high-performing poor students. The secretariat is tasked with overall program management, coordination, and processing of tax incentive applications.