IBPS PO SYLLABUS FOR PRELIMS  + MAINS 
IBPS PO Syllabus : Quantitative Aptitude
Here are the topics included in the IBPS PO syllabus related to Quantitative Aptitude:

• Simplification and Approximation: BODMAS, Square & Cube, Square & cube root, Indices, fraction, percentage, etc.
• Number Series: Missing Number series, Wrong number series, etc.
• Inequality: Linear equation, Quadratic equation, Quantity comparison (I and II), etc.
• Arithmetic: Ratio and Proportion, Percentage, Number System, HCF and LCM, Average, Age, Partnership, Mixture and Alligation, Simple Interest, Compound Interest, Time and Work & wage, Pipe and Cistern, Profit and Loss & Discount, Speed Time Distance, Boat And stream, Train, Mensuration 2D and 3D, Probability, Permutation, and combination, etc.
• Data Interpretation (DI): Table DI, Missing Table DI, Pie chart DI (single and multiple pie chart), Line chart DI (Single and multiple line), Bar chart DI, Mixed DI, Caselet (Simple table-based caselet, Venn diagram based caselet, Arithmetic based caselet) etc.
• Data Sufficiency (DS): Two Statement Data Sufficiency

IBPS po- Numerical Ability Books 

• SmartBook by Testbook by S.Chand-Covers all the important concepts related to Numerical Ability including Arithmetic, mensuration, geometry and data handling.
• Quantitative Aptitude by R.S.Agarwal -Contains chapters related to the tricks and important portions of quantitative aptitude.
• Data Interpretation by Arun Sharma-Covers portions related to data handling and interpretation
• Objective Mathematics by Tarun Goyal-Contains one shot explanation of all the topics for the quants section.

IBPS PO- Numerical Ability Preparation

• To clear IBPS Clerk Prelims in first attempt, answer the 25 questions correctly from Numerical Ability a.k.a. Quantitative Aptitude. Check out the expert-recommended IBPS Clerk Prelims preparation tips for this section below.
• Questions from topics viz. Number Series, Quadratic Equation, Simplification Questions, and Data Interpretation are most commonly asked and are easy to solve as compared to other sections.
• Learn the calculation techniques and make sure to know the formulae and tables up to 25, squares and cubes up to 30 & percentage-decimal-fraction table equivalent by heart to solve lengthy questions in a short span of time.
• In the case of Data Interpretation (Pie, Caselet), Data Sufficiency questions, you need to develop analytical skills to understand and interpret the given data
• Other tricky topics like Permutations and Combinations, Probability might consume more time, so attempt them at last.
• Make sure to practice 2-3 weeks on Quant before the exam using proper books such as Quantitative Aptitude for Competitive Examinations by R.S Aggarwal, Fast Track Objective Arithmetic by Rajesh Varma, and know how to crack IBPS Clerk Prelims Quant easily.