Look at this video lecture hard disc for physics, mathematics and chemistry by M-Learning. These lectures are prepared by experienced and famous lecturers This external hard drive contains: 968 hours of 1969 video parts with 480 GB size. Supplemented with 3437 pages and 156 MB size of e- study material. It covers Physics, Mathematics and Chemistry of XI, XII standard CBSE and competitive exams like IITJEE mains and IITJEE Advance. Validity: 2 years. Compatible OS: Windows XP/7/8 , License: Single Machine with Windows Operating System.