I have used this application during my JEE preparation , or more correctly, I was forced to use it .
Talking about the features and quality of this application, it's an awesome app for school going students and competitive exam aspirants like JEE, BITSAT etc. It teaches the syllabus subjectwise wherein each subject is divided into several chapters . For each chapter , there are written concepts covering all concepts , formulae and tricks in the form of short notes of that particular chapter. Besides, there are topicwise video lectures on all those concepts. One can either refer the entire playlist or just the doubtful portion depending on their needs. Then , there are topicwise practice test arranged for each of those chapter then and there in section called "goals"at the end of which your result and complete analysis of your performance in terms of accuracy , speed etc is also generated . Additionally there is a section called "challenge"to test your knowledge by the end of finishing the chapter. "Ask a doubt "allows you to ask any doubt from their faculty at any time by typing your doubt and attaching corresponding picture of the doubt if there is any. App also provides full length test series to test your complete preparation for whatever exam you are preparing for.
But their team has converted all this into a business to satisfy their greeds. Couple of members of their team came to my home in the mid feb of last year when there was hardly 1.5 month left for my exam . And they just brainwashed my father's mind and played marketing tricks preventing my father to listen to me but only to them and in the end imposed their package on me ( WHICH I WAS NOT NEEDING) in Rs.10, 000. They caused a huge fight between me and my father and ruined my entire day. So for me it was not less than any evil.
I would suggest you people to use the application wisely and not get fooled by their marketing tricks