e-taz is a free Android application developed by Leader Vision Group. The app is designed to assist those who are preparing for the Mongolian Civil Service Exam. It provides users with a comprehensive set of study materials and practice tests to help them succeed on the exam.

The app's interface is user-friendly and easy to navigate. The study materials cover a wide range of subjects, including Mongolian history, politics, economics, and law. The practice tests are designed to simulate the actual exam, providing users with a realistic testing experience. The app also allows users to track their progress and performance, helping them identify areas where they need to improve.