The current book "IBPS RRB Guide for Officer Scale I Preliminary & Main Exams 2020 with 4 Online Tests" covers all the 6 sections asked in the RRB exam English Language, Hindi Language, Quantitative Aptitude, Data Interpretation, Reasoning, Computer Knowledge and Financial Awareness. The book provides the Solved Papers of 2015 - 2019. The book covers Revision Material on Financial Awareness. The book provides 4 Online Practice Sets - 2 for Preliminary & 2 for the Main Exam on the latest pattern of the exam for the Mock Online experience. The book will be useful for Scale I, Scale II (GBO) & Scale III. The book provides well illustrated theory with exhaustive fully solved examples for learning. This is followed with an exhaustive collection of solved questions in the form of Exercise.