Creates the School Spending Efficiency and Relief Act. Requires each school district to undertake budgetary and expenditure control actions to ensure that administrative expenditures do not exceed 15% of the school district's total operating expenditures. Requires any school district with administrative expenditures exceeding 15% of its total operating expenditures to implement a mandatory annual reduction plan that reduces administrative expenditures by 1% for such time as is required to bring the school district into compliance. Prohibits any school district that is out of compliance from hiring additional administrative personnel. Requires each school district to post an annual budget report online. Allows a school district to increase its tax levy only if the average student enrollment increases by an amount proportional to the tax levy. Requires a school district to decrease its tax levy by a proportional amount whenever the school district's average student enrollment declines. Requires any new contract for a superintendent or assistant superintendent position to be made publicly available at least 30 days prior to approval. Requires any proposal by a school district to increase expenditures on outside consultants and any consultant contract in excess of $25,000 to be made publicly available at least 30 days prior to approval. Requires each school district to enact a budget that either maintains or increases instructional spending as a percentage of total school district expenditures. Provides for a State mandate relief block grant program and a voluntary statewide purchasing consortium. Makes other changes. Repeals the Act on January 1, 2032. Effective immediately.