In the expenditure of funds out of its appropriations for determination of true values of locally-taxable real estate for use by the Board of Education in state school fund distributions, the Department of Taxation shall use a sufficiently representative sampling of parcels, in accordance with the classification system as established in § 58.1-208, Code of Virginia, to reflect actual true values; further, the Department shall, upon request of any local school board, review its initial determination and promptly inform the Board of Education of corrections in such determination.