Hi friend, the application is one of the best application for student to study. Every small concepts is clear in the application in simple English. So every student must download the application for great feature. In lockdown it is very helpful for student to study. In this application all the stafs are well educated. App is well designed.but the thing that annoys me the most is the unnecessary calls that come. I respond the necessary calls only. But their are many unnecessary calls to. But the overall this app is best.