Complex sentence: The academy recruits scholars from the final class of their Junior secondary schools and work with their throughout their Senior secondary school, having them come for additional tutelage to complement what they learn in school and get them well groomed for their national examinations.
Split into simpler sentences: The academy recruits scholars from the final class of Junior secondary schools, and they work with them throughout their Senior secondary schooling. They have them come for additional tutelage to complement what they learn in school and get them prepared for their national examinations.