In IBPS PO prelims, there are a total of 100 questions each carrying 1 mark. In preliminary exam, there are 30 questions in english, 35 questions in quantitative aptitude and 35 questions in reasoning ability. There is a sectional cut-off in all the 3 sections which you will need to qualify separately as well as the overall cutoff. As a result of this, every year the cut-off changes. In 2018, the cut-off was 56.75 for general, 55.50 for OBC, 49.25 for SC and 41.75 for ST category. So try to solve correctly more number of questions as there is a negative marking of 0.25 for each wrong answer.