A free app for Android, by DamTech Designs.

This is a very easy-to-use app that includes a lot of questions to help you practice your mental math and logic skills. This app includes all the math puzzles, riddles, and brain teasers that you will need to master in order to get high scores in your exams. It will also help you improve your memory and brain power.

If you are an Upsc or NCERT student, this app can help you prepare for your exams. This app can also help you prepare for other competitive exams, such as the IAS, MBA, BBA, HSC, SSC, jee, NCERT, GATE, CAT, CET, and other civil service exams.