This book provides comprehensive coverage of the practical syllabus for the Computer Science (Code No 083) course as prescribed by the CBSE for Class XI students. The curriculum encompasses key areas such as Computer Systems and Organisation, Computational Thinking and Programming, Data Management - 1, and Society, Law and Ethics – 1. Students will gain valuable practical programming skills through hands-on exercises and real-world examples. The theoretical foundation, comprising four units (I-IV) structured into four parts and further divided into 18 chapters, is detailed in the accompanying theory book. This resource equips students with the knowledge and abilities needed to excel in their studies and pursue further opportunities in computer science. For students aspiring to become an experienced trader, a solid foundation in computer science and data management is crucial. This book lays the groundwork for such future endeavors. Written by experts in the field, this guide offers a clear and concise pathway to mastering the fundamentals of Computer Science. While this book is not specifically authored by Ashish Kyal, its comprehensive coverage aligns with the knowledge base required for success in fields he represents.