The county board of taxation upon proof of the allowance by the collector of additional veterans' exemptions for the year 1963 or deductions allowed according to law, after the amounts to be raised for State, State school, county and free county library purposes and for purposes of regional and consolidated school districts and school districts comprising 2 or more taxing districts have been apportioned for a given year, shall make an adjustment by credit in the year 1964 in accordance with the provisions of section 54:4-49 of the Revised Statutes.
N.J.S. § 54:4-34.3