All appeals from the rulings of the board of equalization fixing value of property shall be taken within 30 days after the final decision of said board fixing the assessed valuation as provided in this chapter. The taxpayer shall file notice of said appeal with the secretary of the board of equalization and with the clerk of the circuit court and shall file bond to be filed with and approved by the clerk of the circuit court, conditioned to pay all costs, and the taxpayer or the state shall have the right to demand a trial by jury by filing a written demand therefor within 10 days after the appeal is taken. When an appeal is taken, the taxpayer shall pay the taxes due as fixed for assessment for the preceding tax year before the same becomes delinquent; and, upon failure to do so, the court upon motion ex mero motu must dismiss the appeal, unless at the time of taking the appeal the taxpayer has executed a supersedeas bond with sufficient sureties to be approved by the clerk of the circuit court in double the amount of taxes, payable to the State of Alabama, conditioned to pay all taxes, interest, and costs due the state, county, or any agency or subdivision thereof. Such appeals shall be preferred cases. If from all the evidence the court is of the opinion that the valuation is either too high or too low, it shall render a judgment fixing such valuation as it may deem fit. The circuit court shall so far as practicable hear such appeals according to the general rules and procedure of courts, but, when acting under this chapter or acquiring jurisdiction as provided herein, it shall have no power to enjoin or suspend the collection of any taxes due. It shall decide all questions as to the legality of the assessment and the valuation of the property. The original assessment sheet or a certified copy, showing the assessment by the board of equalization, shall be sufficient appearance by the state and shall make out a prima facie case. From the judgment of the circuit court, either the state or the taxpayer may appeal directly to the Supreme Court of Alabama within 42 days of the entry of such judgment. Upon such appeal to the circuit court or to the Supreme Court, the court shall ascertain and determine by its judgment the amount of tax which was invalid or which was excessive both as to the amount paid to the state, counties, county boards of education, municipalities, or other governmental agencies receiving any part of such taxes, and thereupon, upon presentation of a certified copy of the judgment to the Comptroller, it shall be the duty of the Comptroller to draw his warrant on the State Treasurer in favor of such taxpayer for such an amount as the judgment of the court shall ascertain and declare has been erroneously paid to the state together with interest from the date of payment, and such warrant of the Comptroller shall be paid out of any funds in the State Treasury as a current obligation of the year in which said refund is ordered. Upon presentation of a certified copy of such judgment to the county commission, or upon presentation of a certified copy of such judgment to a county board of education or to the city council or other governing body of any municipality, or upon presentation of a certified copy to the governing body of any other agency of the state which may have received any part of said tax erroneously paid as determined by the judgment, it shall be the duty of the county commission or the county board of education or of the city council or other governmental body of a municipality or of the governmental body of any other agency receiving any part of such taxes to draw its warrants on the treasurer of such county, school board, municipality, or other agency in favor of the taxpayer for such amount of said tax as may have been erroneously paid to such county, school board, municipality, or other agency, together with interest from the date of payment, and such amount shall constitute a preferred claim of the current year in which said refund is ordered, and the respective treasurers are hereby required to refund such amounts received by said county, school board, municipality, or other agency, with interest as herein provided. In the event the judgment of the court shall fix an assessment greater than that upon which the taxes have been paid on the assessment appealed from, the court shall fix and determine the amount of such excess, and the taxpayer and the sureties on his appeal bond shall be adjudged to pay taxes due by reason of such increased assessment with interest from the date of judgment, and the lien and priorities of the state and counties or other agencies shall apply to such additional amount as in other cases. The court, in fixing the assessment, shall order the assessing authorities to apportion the same and the collecting authorities to collect taxes thereon for the several taxing subdivisions in the manner provided by law.