Coding-Decoding Questions for RRB Clerk Exam 2025, Download PDF

Key Takeaways

• Coding-Decoding is a high‑scoring, quick‑solve topic (4–6 marks) in RRB Clerk exams.
• Master common rules like shifts, reversals, and substitutions through consistent practice.
• Strengthen basics, use shortcuts, attempt mocks, and analyse mistakes daily for speed and accuracy.

The IBPS RRB Clerk exam is one of the most competitive banking exams in India, and the Reasoning Ability section plays a crucial role in determining success. Among the various reasoning topics, Coding-Decoding consistently appears in both Prelims and Mains. In this blog, we will discuss the importance of preparing for coding and decoding, along with some questions in PDF format to practice, so that you can excel in this topic. 

Why Coding-Decoding Matters in RRB Clerk Exam

Coding and decoding generally appear in sets during the mains examination. It is also one of the most scoring topics that can be solved quickly. This topic is asked in RRB Clerk Exam to test the candidates’ ability to decode information. 

Types of Coding-Decoding Questions asked in RRB Clerk Exams

In this section, we are going to discuss the types of coding-decoding questions asked in RRB Clerk exams. 

1. Letter Coding
   

Example: If CAT is coded as DBU, then DOG is coded as? In this case, each letter is shifted by +1.

2. Number Coding
   

Example: If BAT = 213, CAT = 312, then RAT = ? Letters are replaced with numbers based on a given logic.

3. Substitution Coding
   

Example: If ‘Apple is red’ is coded as ‘X Y Z’, then ‘Banana is yellow’ might be coded as ‘P Y Q’.

4. Mixed Coding
   

Multiple statements are coded, and candidates must decode the meaning by comparing common words.

5. Chinese Coding (Statement Coding)
   

Example: If ‘Banks are digital today’ is coded as Lkd Mkd Kkd Tkd, then candidates must decode based on repeated patterns.

Download Coding-Decoding Questions PDF

In this section, we are providing coding-decoding questions PDF for practice using the tips given in the blog and ace this section in the exam to score better.

Download Coding-Decoding Questions PDF

Strategies to Solve Coding-Decoding Quickly

In this section, we will provide strategies to solve coding and decoding problems more efficiently. We will use examples to explain different concepts.

Now that we’ve explored some examples of coding-decoding questions, let’s move on to a few useful tips and shortcuts that can help you tackle them with confidence.

• Don’t be intimidated by these questions,give them a try and see how well you can solve them. With enough practice, you’ll find them much easier and even gain an edge over others.

• Read carefully: Go through the question thoroughly and jot down the codes once you identify the pattern.
• Stay calm with new patterns: If you come across an unfamiliar style of coding-decoding, remember that it’s new for everyone. Focus on the information given and what the question is asking.
• Watch for combinations: Sometimes, coding-decoding is mixed with other concepts like blood relations or direction sense. Regardless of the mix, the core principle remains the same. Estimate the time required and decide whether to attempt it.
• Practice is key: The more you practice, the better you’ll get at judging how long a question will take and the faster you’ll solve it.
• Memorize alphabet positions: Learn the positions of letters both forward and backward. A handy trick is to remember the words EJOTY and VQLGB.

Alphabet	Position (Forward)	Position (Backward)
E	5	V = 5
J	10	Q = 10
O	15	L = 15
T	20	G = 20
Y	25	B = 25

Sample Practice Questions

Letter Coding
If ROAD is coded as URDG, then PATH is coded as?

(a) SBUJ

(b) RCUJ

(c) QZSG

(d) None of these

Answer: (a) SBUJ

Number Coding
If A = 1, B = 2, … Z = 26, then what is the code for BANK?

(a) 2-1-14-11

(b) 3-2-15-12

(c) 2-2-13-10

(d) None of these

Answer: (a) 2-1-14-11

How to Prepare Effectively for Coding-Decoding?

Here we are giving a strategy on how to prepare for Coding-Decoding when almost 1.5 months are left for the exam. 

Start with the Basics

Learning alphabet positions (A=1, Z=26) and number patterns builds a strong foundation. It helps decode reasoning questions quickly, improves accuracy, and strengthens mental associations between letters and numbers.

Use Shortcuts

Memorising common shifts like +1, -1, or reversing alphabet saves time. These shortcuts reduce calculation effort, allowing faster recognition of patterns and quicker problem‑solving during reasoning exams.

Mock Tests

Attempting sectional mock tests simulates real exam pressure. It improves time management, highlights weak areas, and builds confidence by practising under conditions similar to the actual test environment.

Analyse Mistakes

Reviewing errors after practice ensures you understand why mistakes occurred. This reflection prevents repetition, strengthens concepts, and gradually improves accuracy, making your preparation more effective and targeted.

Consistency

Dedicating at least 20 minutes daily to reasoning practice, particularly to coding-decoding, ensures steady progress. Regular exposure sharpens logical thinking, builds retention, and develops exam‑ready speed without overwhelming your schedule.

Conclusion

The Coding-Decoding section in RRB Clerk is not just about solving puzzles; it’s about solving them fast and accurately. With consistent practice, smart strategies, and the right study material, you can easily score full marks in this area. You can take the subscription to our test series, where you can reattempt the full-length mock tests and get a Detailed Comparison with the Topper, compare your Time, Score, Accuracy, Correct/Wrong Answers, and even the Average Performance side-by-side.

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Disclaimer: This article has been prepared for informational and educational purposes only, based on previous exam trends, expert analysis, and publicly available data. It is not an official notification, and the Institute of Banking Personnel Selection (IBPS) has not endorsed or released the content herein. While every effort has been made to ensure accuracy, exam patterns and question types may change, and readers are advised to verify details with official IBPS updates. The practice material and predictions provided are intended to support preparation and should not be considered guaranteed exam content. Neither the authors nor PracticeMock accept responsibility for any discrepancies, errors, or outcomes arising from reliance on this article. For official information, please refer to the IBPS website.