Educational services, namely, services that exclusively benefit children in kindergarten through twelfth grade and their parents and educators in connection with educational skills directed to children in kindergarten through twelfth grade (excluding students in adult education), through an integrated process of test and diagnosis and skill-building by providing exercises, educational games, tests and curriculum-related activities in the fields of language arts, math, social studies, science, music, and visual arts, and distributing course materials in connection therewith, all to address deficiencies revealed by standardized test results