Oswaal Books CBSE Class 12 Biology 15 Sample Question Papers for 2020 Exam. Includes marking scheme released on 15.05.2019 (CBSE Circular No. 13/2019) and handwritten topper's answer sheet, design of the question paper issued by CBSE. Strictly as per the CBSE Revised Syllabus dated 29th March, 2019 for March, 2020 Exam