Look at this external hard disk for the combine study of mathematics and chemistry subject of 11th class. The e- study materials are prepared by experts in the particular field and can be used for detail study of engineering entrance exam preparation . This external hard drive contains: 316 hours of 626 video parts with 153 GB size. Supplemented with 946 pages and 37 MB size of e- study material. It covers Mathematics and Chemistry of XI standard CBSE and competitive exams like IITJEE mains and Advance. Validity: 1 year. Compatible OS: Windows XP/7/8 , License: Single Machine with Windows Operating System.