Any child not otherwise eligible for entry to first grade who successfully has completed a kindergarten program in a public or private school shall be permitted entry to the school program: Provided, That the kindergarten program standards substantially equaled or exceeded the applicable basic education program requirements of RCW 28A.150.220 and WAC 180-16-200 through 180-16-220, each as now or hereafter amended: Provided further, That if the district of entry has reason to believe that an individual child so qualified may not succeed in the district's first grade program, the district shall have the option of placing the child in either kindergarten or the first grade for evaluation in the areas specified in WAC 392-335-025 and a final determination of the child's appropriate grade level placement no later than the thirtieth calendar day following the child's first day of attendance.