It is a very good app. But it is a paid app . It has videos which explain concepts very well. It is a very good for 4th to 12th iitjee, aipmt, cat, ias, gmat, grae. But I would like you to join only in 10th and 12th and afterward. You should have atleast 3 g or 4g for running videos.
But there are a few trick to to use it for free.
1st is to join its beta version app. Beta version version are app which app developers use to test their products or app new features and users have to give review about app. First you have to search app in play store and then at last there is a option of beta app. Click on I’m in download beta app. Warning: beta apps are sometimes very unstable apps.
2nd is to create a app installer of the app. You create it by xender or shareit and by creating multiple e-mail id or mobile phones numbers. But is for 3 to 5 day per login only.