CBSE board exam 2023-2024 Class XII will consist of four compulsory papers each carrying 100 marks with 90 minutes duration for every paper. CBSE has reduced 50 marks from section A (Physical Education) by reducing experimental questions so that students have sufficient time to solve theoretical question papers which carry 200 marks with three hours’ duration. CBSE has also revised the old syllabus of biotechnology to ‘Microbes and Bioremediation’ which includes genetic engineering, recombinant DNA technology, synthetic biology etc.