This book is a comprehensive guide for Class 9 Science students following the CBSE curriculum. It covers Physics, Chemistry, and Biology in a clear and structured way, focusing on conceptual understanding and exam preparation. Each chapter includes concise theory, important formulas, diagrams, NCERT-based questions, and additional practice exercises. It also provides multiple-choice questions, short and long-answer questions, and previous year board questions for thorough revision. Designed for self-study, this book helps students strengthen fundamentals, improve problem-solving skills, and achieve high marks in school exams and board examinations.