This is good app for understanding concepts.BUT don’t buy its premium, they will take rupees 24, 000 per year for the same video that are available without primium but are offline and some live classess that are not of much use AND you can’t even cancel to continue premium after 15 days.AND now I am stuck and I have to see videos and attend live classes and pay rupees 48, 000 for 2 years UNWILLINGLY!