Sec. 1. From and after the effective date of this act in any county in this state having a population of not less than 312,000 and not more than 330,000, the general management and control of the public free schools and high schools in each county unless otherwise provided by law shall be vested in five (5) county school trustees elected from the county, one of whom shall be elected from the county at large by the qualified voters of the county and one from each commissioners precinct by the qualified voters of each commissioners precinct, who shall hold office for a term of two (2) years. The time for such election shall be the first Saturday in April of each year; the order for the election of county school trustees to be made by the County Judge at least thirty (30) days prior to the date of said election, and which order shall designate as voting places or places at which votes are cast for the district trustees of said common and independent school districts, respectively. The election officers appointed to hold the election for district trustees in each of said school districts, respectively, shall hold this election for county school trustees.