Buy an excellent study material for class 12th students in Mathematics and Chemistry. Use this external hard drive to learn at your own place. This external hard drive contains: 293 hours of 627 video parts with 143 GB size. Supplemented with 1159 pages and 48 MB size of e- study material. It covers Math and Chemistry of XII standard CBSE and competitive exams like IITJEE Mains, IITJEE Advance. Validity: 1 year. Compatible OS: Windows XP/7/8 , License: Single Machine with Windows Operating System.