First start preparing you must know the syllabus of your exam then start focusing on some important topics. Check the previous year question paper to know the level of paper. So The best way to prepare for RBI Grade B exam is by focusing on economic survey, union budget of the current year, RBI policies etc for the general awareness section. For the English section, it is important to have a good grasp of the language.Quantitative Aptitude questions require practice. The questions are not tricky but require practice and focus. Read one newspaper daily either The Hindu, Mint or BS.