Understanding Lower Secondary Physics (Revised Edition S.1–S.4) by Semu Joseph is a well-structured textbook designed to help students clearly understand physics at O-Level. It provides detailed explanations of key concepts, worked calculations, and a wide range of questions—especially those aligned with UNEB exams—to strengthen both knowledge and problem-solving skills.
The book is tailored to the revised competency-based curriculum, emphasizing practical understanding, critical thinking, and real-life application of physics concepts, making it useful for both learners and teachers.