Before issuing any warrants hereunder, the board of education by which such warrants are proposed to be issued shall cause an application for approval of such issue to be filed with the State Superintendent of Education. Such application shall be in such form and shall contain such information as the State Superintendent of Education may prescribe, and he may require such further information as may be necessary relating to the proposed warrants or other financial or educational matters under the control of such board of education. He shall not approve the issue of any warrants hereunder which would jeopardize the state's Foundation Program of education as prescribed by law and in accordance with the rules and regulations of the State Board of Education. He shall not approve the issue of any warrants hereunder when the principal of or the interest on any other warrants constituting a preferred claim against the tax proceeds to be pledged for payment of the proposed warrants is overdue and unpaid, except warrants to refund the same. The written approval of the State Superintendent of Education of the amount and general purpose of the warrants shall be a sufficient approval of the issue, but he may at his discretion approve any of the terms and provisions of the warrants which in such event shall not be issued otherwise. He shall not approve the issuance of any refunding warrants unless evidence presented to him in his judgment shows:
(1) That an interest saving will thereby be effected without extending the date of payment of the warrants desired to be refunded;
(2) That payment of warrants desired to be refunded will prevent the issuing board of education from operating schools the customary term in their jurisdiction;
(3) That an extension of the time of payment of the warrants desired to be refunded is necessary to prevent the state's Foundation Program from being jeopardized; or
(4) That the proceeds of the tax pledged for payment of the warrants to be refunded are not or will not be sufficient for the payment of the principal of and the interest on such warrants.
The state superintendent's approval of the issue of any warrants hereunder shall be a conclusive determination that all necessary evidence has been presented to him. The written approval of the State Superintendent of Education of the issue of any warrants hereunder shall be a conclusive determination in favor of the validity of such warrants that all of the requirements of this article have been complied with. The State Superintendent of Education may also determine conclusively for all purposes relating to the validity of any warrants issued hereunder whether any other warrants constitute a preferred claim against the tax proceeds out of which the proposed warrants are payable. In all matters connected with his approval of warrants, the State Superintendent of Education shall comply with any regulations or instructions of the State Board of Education, but his failure to do so shall not affect the validity of warrants approved by him.