First, there should only be one mandatory standardized test given in odd number of grades.
Second, School districts should consolidate until it makes sense. Group counties together until they get to roughly the size of Desoto County's attendance. It is not that difficult. The problem is, most populated areas do not want to send their dollars out of town for the rural folks to benefit.
Third, and I cannot stress this enough, the state needs to meet their education funding requirements by law. That means yes, raising state taxes.