The purpose of this chapter is to provide supplemental funds to each school district to be used for the sole purpose of providing direct remedial instruction to those students enrolled in the K-12 program who have need of special educational assistance in order that their level of educational attainment may be raised to that appropriate for their age. It is the intent of the Legislature that each school district utilize the instructional programs which, in the professional opinion of the local school officials, will be most effective and that the effectiveness of this program be evaluated in terms of the increase in student achievement in the basic skills of reading, mathematics and writing as measured by pretest and post-test of each student receiving special educational assistance from the funds provided by this chapter.