Shivdas CBSE Class 12 Chemistry book. Prepare for the 2025 board exams with past 10 years of board and sample papers. Includes 45+ question papers, solved previous years' board papers (2015-2024), CBSE-based sample papers, and extra solved sample papers with QR codes. Follows the latest CBSE syllabus and assessment guidelines. New sample paper with mock answer sheet inside.