I am fond of many academic and curriculum based application. One such was Topperlearning application. Among the all apps I came through I found this app to ve very unuseful and not helpful. Its really out of date app. First of all the course material is fully paid. They just show the brilliant demo videos and ask you to but the full version.
The curriculum and syllabus is outdated in all three that is Cbse, Icse and State board. The videos sometimes finds boring to children as there no animation in it. Also for one particular course they have very high rates. The mock tests are pretty average and not up to the mark. Its not a value for money.