Radhey Sir creator text Uttar Pradesh S. Chand Publishing 2025 monographic 312p. 27cm(pb) Radhey Sir Chapter-wise Coverage with Detailed Explanation & Short Tricks | NTPC CBT 1 & 2, RPF SI, RRB Group D RRB JE & Other Railway Exams 2025 000 9789364682312 ENG-146855 DBAD 20250926103821.0