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.