Coding-Decoding
Practise letter coding, decoding, letter-to-number codes and sentence coding in the RRB NTPC CBT 1 pattern: 6 bilingual sets from easy to hard.
Topics Covered in Coding-Decoding
Coding-Decoding Practice Tests
Coding-Decoding Practice Set 01
Coding-Decoding Practice Set 02
Coding-Decoding Practice Set 03
Coding-Decoding Practice Set 04
Coding-Decoding Practice Set 05
Coding-Decoding Practice Set 06
Smart Practice Path
Start with Easy, move to Medium, and challenge yourself with Hard test results.
Why Practice Coding-Decoding?
- Coding-Decoding is one of the most regular topics in CBT 1 reasoning
- Trains letter-position speed (A = 1 … Z = 26) used in many other topics
- Sentence coding builds the elimination habit needed for puzzles
- Each set is 15 questions in 12 minutes with 1/3 negative marking
Concepts You Will Master
- Uniform, alternate and increasing letter shifts
- Opposite letters (positions add up to 27), reversed words and swapped letter pairs
- Codes from the sum of letter values, reverse values and multiples
- Letter-wise number codes such as 16-5-14
- Finding a word's code from common words in two or three sentences
Preparation Tip
Write the positions of the example word and its code one under the other; the shift pattern usually shows at once. For sentence coding, compare two sentences at a time and remove codes you have already fixed.
Explore Other Reasoning Topics
About Coding-Decoding
Coding-Decoding questions hide a word or number by a rule, and you must find that rule from an example. These six sets move from simple shifts to reversed and opposite-letter codes, number codes and sentence coding. Every question has an explanation in English, Hindi and Hinglish.
FAQs
There are 6 sets: 2 easy, 2 medium and 2 hard. Each set has 15 questions and a 12-minute timer.
Each correct answer gives 1 mark and each wrong answer deducts 1/3 mark, the same as RRB NTPC CBT 1.
Yes. Every question can be attempted in English or Hindi, and solutions are given in English, Hindi and Hinglish.
Letters whose positions add up to 27: A–Z, B–Y, C–X and so on. Many codes replace each letter with its opposite.
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