There are several books available that are considered helpful for preparing for railway exams (non-technical). Here are a few popular choices:-
Kiran’s Railway Non-Technical CBT Question Bank 1997 Till Date - 2225+ Objective Questions by Kiran Prakashan: This book contains a large collection of objective questions covering various topics relevant to railway exams. It includes questions from previous years' exams as well as practice exercises.
Guide to RRB Non-Technical Recruitment Exam by Disha Experts: This book provides comprehensive coverage of the syllabus for railway non-technical exams. It includes practice sets, previous years' solved papers, and detailed explanations of concepts.
RRB NTPC (Non-Technical Popular Categories) Exam Guide by RPH Editorial Board: This guidebook is specifically designed for candidates preparing for the RRB NTPC exam. It covers all sections of the exam with detailed explanations and practice questions.
Fast Track Objective Arithmetic by Rajesh Verma: This book is helpful for improving mathematical aptitude, which is an important section of railway exams. It covers various topics such as arithmetic, algebra, geometry, and data interpretation.
Lucent's General Knowledge by Lucent Publication: This book is a popular choice for general knowledge preparation. It covers a wide range of topics including history, geography, polity, economics, science, and current affairs.
Reasoning Ability: A New Approach to Reasoning Verbal & Non-Verbal by B.S. Sijwali and Indu Sijwali: This book provides comprehensive coverage of reasoning ability topics commonly asked in railway exams. It includes both verbal and non-verbal reasoning sections with practice exercises.
It's important to choose a book that aligns with the specific exam pattern and syllabus of the railway non-technical exam you are preparing for. Additionally, supplement your preparation with solving previous years' question papers and mock tests to assess your progress and improve your time management skills.