PCS Mantra is a free Android app developed by TRIGREXAM that offers online exams and video tutorials. The app provides a comprehensive platform for students to learn and practice for their exams.

The app's interface is simple and user-friendly. The main menu has options for online exams, video lectures, and practice sets. The online exam feature allows students to take mock tests for various competitive exams. The video lecture section has a vast collection of video tutorials on different subjects, which can be accessed anytime, anywhere. The practice set option provides chapter-wise questions for students to practice and evaluate their knowledge.

Overall, PCS Mantra is an excellent app for students preparing for competitive exams. Its vast collection of video tutorials and chapter-wise practice sets make it an all-in-one platform for exam preparation. However, the app could benefit from adding more interactive features and improving the design of the interface.