How to prepare for RRB? How many subjects to study and what? Which author's book is good for reading?

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Yes, the Railway Recruitment Board has released the RRB NTPC (UG) result 2025 for the notification CEN 6/2024 on its regional portals. The regions selected the candidates based on their regional vacancies. 

Yes, the syllabus for RRB JE Stage 1 and 2 are different. As Stage 1 CBT focusses on the general subjects including Mathematics, General Science, General Awareness, etc. While in Stage 2 CBT techincal specific subject is asked along with the General Awareness & Science, basics of computer and applications, etc.

RRBs conducts various exams for recruitment to the post of Junior Engineers, Assistant Loco Pilot, Non-technical and popular category, Group, C/Group D, and other posts in departments and offices of Indian railways.

For pattern (aptitude, reasoning, GA) + scale, look at SSC (CGL, CHSL), IBPS (PO/Clerk/RRB), State PSCs, Insurance exams (NIACL, LIC AAO), NRA CET (when active), and DFCCIL/Metro Rail recruitments. If you're eyeing technical RRB JE/SSE, then GATE (for core prep in depth), SSC JE, and state electricity board/PSU junior engineer exams mirror the technical flavour. Build a shared base: Quant, LR, GA (Indian polity, economy, railway basics), and speed tests—then add the technical or job specific layer only where needed.