How to Prepare Quantitative Aptitude for OICL AO 2025?

Hardly a month is left for the OICL AO 2025 Exam. In such a situation, it is very important to prepare the Quantitative Aptitude section. This particular section requires a lot of practice. But before practising, you need a proper strategy to make sure you cover the most important topics and practice them as much as you can. In this blog, we have come up with a strategy on how to cover the Quants section for the upcoming OICL AO Exam 2025.     

Topic-wise Weightage for OICL AO Quant 2025

In this section, we have provided the topic-wise weightage for OICL AO 2025. The weightage is based on the previous year’s paper analysis by our experts.  

Topic	Weightage
Simplification & Approximation	5-7
Number Series	3-5
Data Interpretation (Table, Bar, Line, Pie)	10-12
Arithmetic (P&L, CI, SI, Time Work, Time Distance, Mensuration, Ratio, Mixture)	10-12
Quadratic Equations	3-4

Strategy to Prepare Quants for OICL AO 2025

In this section, we have provided the topic-wise strategy to cover the quants section. How to prepare a particular topic and how you should proceed further. 

Simplification and Approximation

Build your foundation on BODMAS, percentage conversions, square–cube values, and fractions. Practice at least 30 questions daily to improve calculation speed. Focus on approximation rules and common number patterns. Target 30-40 seconds per question. Use Vedic Math techniques for addition, subtraction, and multiplication.

Number Series

Start with basic patterns such as +n, –n, ×n, ÷n, square patterns, cube patterns, AP, GP. Practice missing and wrong series separately. Solve 15–20 sets daily. Maintain a formula sheet for common series multipliers like ×1.5, ×2.5, etc.

Data Interpretation

DI is the highest-scoring part. Focus on ratio calculation, percentage comparison, and average-based DI. Solve all forms: tabular, bar, pie, caselet, line graphs. Practice two DI sets every day. Learn how to approximate values without compromising accuracy to save time.

Arithmetic Chapters

Prepare arithmetic in a concept + formula + application style. Learn standard formulas for Time & Work, Time-Speed & Distance, CI-SI difference, Mixture & Alligation, Mensuration 2D & 3D. After learning a chapter, solve 50-70 questions of mixed-level difficulty. Revise weekly because arithmetic is high-weightage.

Quadratic Equations

Focus on factorisation, sign rules, and comparison of roots. Practice at least 20 questions in intervals. Quadratics are usually easy marks; aim to solve them within 20-30 seconds.

30-Day Study Plan for OICL AO Quant

Week	Focus Areas	Daily Tasks
Week 1	Basics + Calculation Speed	Tables, squares, cubes, simplification, approximation, basic arithmetic
Week 2	Core Chapters	Arithmetic (P&L, Ratio, TSD, TW), Quadratics, Number Series
Week 3	DI Mastery	Solve 2-3 DI sets daily + mixed arithmetic problems
Week 4	Full-Length Practice	Attempt 4-5 mock tests, analyse mistakes, revise weak topics

Common Mistakes to Avoid while OICL AO Quants Preparation

In this section, we have explained the common mistakes that generally students commit and it costs them their selection. But by knowing this, you can avoid it and boost your performance in the exam. 

Spending too much time on DI without using approximate shortcuts

Aspirants often try to solve every DI value exactly, and that’s where the time slips away. In the exam, you must use approximation for faster comparisons.
Example:
If the value is 48.97% of 799, you don’t need perfect accuracy. Approximate it as 50% of 800 = 400 and move ahead. This saves 30-40 seconds per question, which adds up across a DI set.

Ignoring arithmetic basics

Arithmetic forms the backbone of OICL AO Quant. If you ignore basics like ratios, averages, and percentage relations, even DI and DS will feel difficult to solve. As this are the basic chapters that generally covers 60% of the arithmetic segment.
Example:
If you don’t remember that 25% = 1/4, you’ll waste time converting decimals repeatedly. Strong basics help you solve compound questions faster, especially in caselets and mixed arithmetic DI. 

Not analysing mock tests

Simply taking mocks isn’t enough, analysing them is where actual improvement happens. You should review every wrong question, missed question, and time-consuming question.
Example:
If you took 3 minutes on a simple TSD question, you must check what step slowed you down so you don’t repeat it in the exam. 

Memorising number series instead of understanding patterns

Series questions come with new patterns every year. If you depend on memorisation, you’ll get stuck whenever the examiner throws an unconventional pattern.
Example:
Instead of trying to remember “×2 + 1”, “×3 – 5” patterns, understand the logic: Is the series increasing? Decreasing? This helps you decode even twisted series in seconds.

Skipping revision

Even if you practise hundreds of questions, you lose speed and accuracy when you don’t revise formulas and concepts regularly.
Example:
If you learned Alligation today but don’t revise it for a week, you’ll forget the shortcut ratio method and end up solving through long steps. Regular revision keeps formulas fresh and boosts confidence during mocks.

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