You can download the 'Rajasthan Police Exam' from the Android app store.
It has all the basic information regarding the exam. It also has study material of many subjects for the Constable Exam.
I suggest you also download Youth4Work's portal Prep Guru – Mock Test Online & Exam Preps practice for the Constable Exam.
My Go - To Mobile Application is YOUTH4WORK'S, RAJASTHAN POLICE CONSTABLE EXAM. It is easy to use and understand. It is full of quizzes which have awesome questions and study material. very knowledgeable. I would recommend to everyone.