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Railway speedy general science 1992-2022 abtak with RRB Ntpc 2020-2021 ka exam questions ka saath 1400 sets Mukhya aakarshan 1.Our universe, 2.nuclear physics, 3.nature science, 4.knowledge of computer, 5.Human body etc best book for railway group D, Ntpc exam, SSC MTS, SSC GD, Bank and other competitive exam The size of the book is (27 L, 21B and 1 h) in cm best book for all competitive exam preparation