We are pleased to present this compilation of CBSE Class 12th Biology Previous Year Solved Paper Code 004 Chapterwise Questions with Videos and Online Test Papers designed to help students prepare efficiently and strategically for their board examinations. This book is structured to provide a clear understanding of each chapter by organizing previous years' questions in a systematic, topic-wise format as per the latest CBSE syllabus and exam guidelines. Biology is a subject that requires both theoretical clarity and the ability to apply concepts accurately in exams. To bridge this gap, we have provided thoroughly solved questions from actual board exams, arranged chapter-by-chapter, so students can strengthen their understanding one concept at a time.