PREP GURU: Exam Preparation App, Mock Tests 2021 is a free and comprehensive online test preparation app for Android devices. Developed by Youth4Work, this app aims to help users prepare for and ace more than 250 competitive exams in Hindi and English. With more than 250,000 well-researched questions, users can practice for exams like GMAT, GRE, SAT, banking exams, UPSC, and many more. The app uses advanced data analytics and has the largest and most comprehensive question bank for all the tests in its database.

One of the app's top features is that it covers all topics from general knowledge tests to the most specialized questions. Users can access mock tests online and improve their speed, accuracy, and reduce test anxiety. The app also has an instant report feature that shows users how they perform on tests. Moreover, users can visit the Discussion Forum to get tips and tricks from other aspirants. The app allows free access to 50 questions daily in exam preparation and offers an affordable upgrade cost for unlimited access.