hey,

these days apps are really useful. but you need to choose the right app which will help you for the preparation process. some apps has advertisement problem and it really disturbing when you are reading something when a pop up appears.

people mostly use app to solve questions or post question to a group which is really helpful. but for a competitive exam learning from books, making notes is really important. you may use app to give examination or test series when you are preparing for any exam.