Both of my sons use this app as they find it very useful for understanding the basic concepts if the topic or subject , It provides a very interactive interface attracting students and the video demonstrations are very easy to understand .They concept of the app is fabulous but it has some anchor weights to it such as it should enable multi - lingual videos and reduce the number of bugs in the app, Apart from this it has a small test after each video demonstration , for student this is the most ideal app for studying.