In addition to the allotments provided above, a school district may provide a program of education and instruction to children ages five (5) years through twenty-one (21) years, who are resident citizens of the State of Mississippi, who cannot have their educational needs met in a regular public school program and who have not finished or graduated from high school, if those children are determined by competent medical authorities and psychologists to need placement in a state licensed facility for inpatient treatment, day treatment or residential treatment or a therapeutic group home. Such program shall operate under rules, regulations, policies and standards of school districts as determined by the State Board of Education. If a private school approved by the State Board of Education is operated as an integral part of the state licensed facility that provides for the treatment of such children, the private school within the facility may provide a program of education, instruction and training to such children by requesting the State Department of Education to allocate one (1) teacher unit or a portion of a teacher unit for each approved class. The facility shall be responsible for providing any additional costs of the program. Such funds will be allotted based on the type of certificate and number of years' teaching experience held by each approved teacher. Such children shall not be counted in average daily attendance when determining regular teacher unit allocation.