Railway Recruitment Board (RRB) will conduct the RRB Group D exam from 17th November to 31st December 2025. Only a few days are left for the exam. Before appearing in the exam, you must check your knowledge of the most scoring topics. You can start this by choosing the tough sections, like mathematics. For that, we have provided free RRB Group D Maths topic tests. These free tests will help you improve your weak areas and boost your overall performance. Below, we have provided the direct link to our free maths topic tests.
The syllabus leans heavily on arithmetic skills, testing your numerical aptitude under pressure. Here are the non-negotiable topics you need to dominate:
1. Number System
Why It’s Important: The Number System forms the foundation of the entire Maths paper. Questions are straightforward but require conceptual clarity and fast calculations. One can score this topic if he/she has good practice to solve these questions.
Key Focus Areas:
Divisibility Rules: Learn rules for 3, 4, 8, 9, and 11. These help in quick option elimination.
LCM & HCF: Practice problems where you have to find LCM/HCF of multiple numbers — very frequent in RRB papers.
Fractions & Decimals: Practice converting between fractions and decimals quickly; comparisons are common.
Squares & Cubes: Memorize tables up to 40, squares up to 30, and cubes up to 20 to boost calculation speed. Learning this can increase your problem-solving skills.
Pro-Tip Alert: Memorize squares up to 302 and cubes up to 153. You’ll thank yourself when dealing with square/cube roots in Simplification or Mensuration!
3. Profit, Loss, and Simple/Compound Interest (SI/CI)
Why It’s Important: This is one of the most important topics because questions will be asked directly based on formulas.
Key Focus:
Profit & Loss: Use the Cost Price: Selling Price ratio method instead of always assuming CP is 100. Practice successive discounts on Marked Price (MP).
SI vs. CI: Understand the difference between CI and SI for 2 and 3 years—it’s a classic trick question. CI calculations often benefit from the ‘Ratchet Method’ or ‘Difference of 2 Years’ formula tricks.
Why It’s Important: These test your logical flow under the guise of math problems. They are certain to be on the paper and demand a specific method.
Key Focus on Time & Work:
LCM Method: To solve questions of these topics, LCM will be used largely. Calculate the total work using the LCM of the time taken. Forget the old Work = Rate X Time formula as the primary tool. Focus on Efficiency calculations (e.g., A is twice as efficient as B).
Unit Conversion: You must instantly convert km/hr <-> m/s by multiplying by 5/18 or 18/5. Try not to waste your time doing this.
Relative Speed: This is important for problems involving trains crossing platforms or boats moving with/against the current. Understand why you add or subtract speeds.
Here, we have mentioned some most important formulas that you should revise daily. These formulas will help you solve questions more quickly. Formulas are categorized according to topics for your convenience
1. Number System – Important Formulas
LCM × HCF = Product of two numbers
Even Number = 2n
Odd Number = 2n + 1
Sum of first n natural numbers = n(n + 1) / 2
Sum of first n even numbers = n(n + 1)
Sum of first n odd numbers = n²
(a + b)² = a² + b² + 2ab
(a – b)² = a² + b² – 2ab
a² – b² = (a + b)(a – b)
2. Percentage, Ratio & Average – Important Formulas
Percentage
Percentage (%) = (Value / Total Value) × 100
Increase or Decrease % = (Change / Original Value) × 100
Successive Change % = x + y + (xy / 100)
Ratio & Proportion
If a : b = m : n, then a/b = m/n
a : b :: c : d → ad = bc
Direct Proportion → a₁/b₁ = a₂/b₂
Inverse Proportion → a₁ × b₁ = a₂ × b₂
Average
Average = (Sum of all terms) / (Number of terms)
New Average = (Old Sum ± Change) / New Number of terms
Note: You are strongly advised to take our free RRB Group D maths topic tests and try to solve questions implementing the above formulas so that you can practice these formulas.
How Top Scorers Conquer Group D Maths Speed?
Toppers don’t just solve the questions; they analyze the questions and their solving process. Doing this process helps them to remember things for a longer time. Just taking the score will not be enough. After you submit one of our free topic tests, you need to drill down on these three diagnostic procedures:
The Accuracy Check (Conceptual Gap): If you missed a question of time, speed, and distance, then try to remember it was because you forgot the relative speed rule, or did you just mess up the 5/18 conversion? Doing this will help you know your weak areas or pinpoint your silly mistakes. Once you know your mistakes, you can work on them and improve them.
The Efficiency Check (Time Metric): Check how much time you are taking to solve a question. After this, think about what was good to spend that much time. For example, if you are solving a percentage question in 1 minute. Then think and analyze how much time it should take. If you think it should take 30 seconds, then do more practice and reduce that time.
The Strategy Check (Logic vs. Formula): Compare your steps with the provided solution. Are you writing out a full equation for a Ratio problem when a 2-line proportion would’ve sufficed? If you are writing the whole solution, then you might be mistaken or wasting your time. Attempt our free RRB Group D maths topic tests and try to practice half a question in your mind and finish the half questions in 2-3 lines on a rough sheet. But pay attention to this only when you rely on it.
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