For students working with an Iowa licensed teacher or developing a portfolio to be evaluated by an Iowa licensed teacher, the teacher determines whether adequate progress is being made. For all other students, the child's score on a standardized test must be above the 30th percentile, nationally normed, in all areas tested. In addition. if the child's evaluation results do not show that the child is at or above his/her grade level, the child must show at least six months progress from the previous evaluation results. Iowa Code section 299A.6.