Buy an excellent study material for class 12th students in Biology and Math. Use this external hard drive to learn at your own place. This external hard drive contains: 208 hours of 420 video parts with 99 GB size. Supplemented with 997 pages and 45 MB size of e- study material. It covers Biology and Math of XII standard CBSE and competitive exams like IITJEE mains, IITJEE Advance, AIPMT and AIIMS. Validity: 1 year. Compatible OS: Windows XP/7/8 , License: Single Machine with Windows Operating System.