This school improvement paper aims to explore a comprehensive approach to enhancing English Language Arts (ELA) standardized test scores at the secondary level through the implementation of a literacy program. The research focuses on four essential components: differentiated instruction, co-teaching, and on-going assessments. The central question guiding this school improvement plan is: "How does the integration of a literacy program, encompassing differentiated instruction, co-teaching, and on-going assessments, and lead to improved ELA standardized test scores at the secondary level?" The proposed school improvement plan looks to provide educators with strategies and tools to effectively engage students in English Language Arts (ELA) learning, fostering a positive and inclusive learning environment. This research aims to contribute valuable insights to the field of education and support schools in their pursuit of academic excellence in English Language Arts (ELA) for secondary level students.