I am also using this app and I was starting by solving some questions from the chapters. Testbook question were very easy and few are high level question. I obtained 100+ in Quant and english both and its take time to load questions. Most of the question are irrelevant and also most of the questions are wrong. The app does not contains the information of the content in depth and are not also described. very easy question are there compared to other sites. the service support is very poor because when I reported me some wrong question but they are not answered me. they also doesnoy reply on your email.never join testbook.com