Railway Online Test Series is an Android application developed by MDS Developer. This free app provides a comprehensive online mock test series for Railway RRB practice and preparation test in Hindi and English. It offers free mocks for Railways Prelims and Mains Exam Preparation, which are based on the latest pattern.

The app provides a wide range of practice and preparation tests covering various topics such as Railway Engineering (RRB), Mathematics, Mathematics (Competitive), Sentence Completion, and Test Papers. The tests are designed to help users improve their knowledge and skills in these areas and prepare them for the actual exam. The app also offers an online Railway Exam Package that users can purchase to access additional features and tests.

Overall, Railway Online Test Series is a reliable and convenient exam preparation tool for anyone looking to excel in the Railway RRB exams. Its user-friendly interface, comprehensive tests, and latest pattern-based mocks make it a must-have app for Railway exam aspirants.