I use this website for study higher physics and anlytics and other higher education.i think the best program run by iit and iisc help for higher education .at a level of higher teacher are not available so this website help me in higher education.the best things about ntpel is certificate given by ntpel is helpful in your professional career better. you can study any whre andeach and every topic there are so many options available so if you not understand then change teachers.one problem with lecture is teacher taks concept only not question so doing question is problem