Editorially revised on 9 October 2026.
Reasoning preparation should help you read conditions accurately, represent them clearly and check whether an answer actually follows. Begin with untimed accuracy, then use the requirements of your chosen examination to plan timed practice. This guide contains six original exercises with explanations and an error-review worksheet. They are educational examples, not official previous-year questions or a prediction of an examination paper.
There is no universal target of forty-five seconds per question or a fixed share of study time that everyone should spend on puzzles. Difficulty, instructions, section limits and scoring rules vary. For a specific railway preparation context, see the Railway Group D guide. Use the mock-test catalogue to inspect available practice, while checking each test's scope and instructions.
Start with the examination's actual scope
The dated official RRB CEN 09/2025 notice gives an illustrative reasoning topic list on page 28 that includes series, coding, relationships, directions, syllogism and analytical reasoning. It says the list is not necessarily exhaustive. This is one dated railway notice, not the pattern of every bank, SSC or recruitment examination. Check the current notice and applicable amendments for your own examination.
The original exercises below use only their stated rules. Their answers do not rely on knowledge of a recruitment pattern. They help you practise distinct operations: tracking movement, ordering items, separating necessary from possible conclusions, applying a defined rule and checking whether information is sufficient. They are not copied or adapted from a third-party worksheet.
Keep preparing
Continue with Sarkari Resume Templates₹299 — coaching के एक महीने से काफ़ी सस्ता / far cheaper than a month of coachingExercise one: direction and final position
A person starts at point O. They move three metres east, then four metres north, then three metres west. Assume a flat grid with north and east perpendicular. Where are they relative to O, and what is the straight-line distance from O?
Answer: Four metres north of O; straight-line distance four metres. The east and west movements have equal size in opposite directions, so the final horizontal displacement is zero. The north movement remains. The total distance travelled is ten metres, but the question asks about the final position and straight-line distance.
Check your error: If you answered ten metres, you added the route length rather than finding displacement. If you answered northeast, you stopped updating the horizontal position after the final west movement. Draw the three movements in order and mark the endpoint before choosing an answer. In another question, turning left or right would require tracking the stated facing direction; do not import a facing direction into this exercise.
Exercise two: ordering with complete conditions
Four labelled cards, A, B, C and D, are placed in a single row from left to right. A is to the left of B. B is to the left of C. D is to the left of A. Each card appears exactly once. What is the order?
Answer: D, A, B, C. The conditions create one continuous ordering chain: D precedes A, A precedes B and B precedes C. Since these are the only four cards and each appears once, the full order follows. The problem says “to the left,” not “immediately to the left”; the complete chain nevertheless fixes the order here.
Check your error: If you treated the first two statements as separate pairs, join them through the shared card B. If a different exercise left one card unrelated to the chain, multiple orders might remain possible. Do not assume uniqueness simply because an arrangement looks plausible. Verify every stated condition against the proposed row.
Exercise three: a necessary conclusion
Consider these statements: all clerks are staff members; some staff members are trainers. Do these statements necessarily establish that some clerks are trainers? Treat the words as formal categories, and do not assume unstated real-world facts.
Answer: No. The trainers mentioned among staff could be outside the clerk category. A possible arrangement is a staff group containing two clerks who are not trainers and a separate staff trainer who is not a clerk. Both statements are true in that arrangement, but the proposed conclusion is false. Therefore it does not follow necessarily.
Check your error: Overlapping staff categories in one drawing does not prove that they must overlap in every permitted arrangement. To reject a necessary conclusion, look for a counterexample that satisfies all the premises. This exercise does not establish the opposite claim that no clerk is a trainer; overlap is possible, but it is not required by the information given.
Exercise four: a series with an explicit rule
A sequence is defined by the rule that each term after the first equals the previous term plus three. The first four terms are 5, 8, 11 and 14. What is the fifth term?
Answer: 17. Apply the stated rule to the fourth term: 14 plus 3 equals 17. The defining rule is supplied, so the answer does not depend on guessing which of many possible patterns the writer intended. In an examination question without an explicit rule, inspect the options and the full question rather than treating one plausible pattern as mathematical proof of uniqueness.
Check your error: If you looked for multiplication or alternating rules before reading the instruction, the mistake was condition neglect. Write the rule in your own words first. This simple exercise is deliberately about instruction-following; it is not evidence that all series questions can be solved by constant differences.
Exercise five: coding under a specified operation
Use the English alphabet in its ordinary order. Replace every letter with the letter two positions later, wrapping from Z back to A when needed. Keep the original order of letters. How is CAT coded, and how is YZ coded?
Answer: CAT becomes ECV: C moves to E, A moves to C and T moves to V. YZ becomes AB because the operation wraps at the end of the alphabet. No letter order is reversed, and the shift is applied separately to each letter.
Check your error: If you produced VCE, you added a reversal the question did not state. If you could not code Y or Z, you overlooked the wrapping rule. For an actual coding question, identify whether the rule concerns letters, positions, numbers or ordering. Do not assume this exercise's two-position shift applies to a different problem.
Exercise six: information sufficiency
Three cards, P, Q and R, occupy a single row, each appearing once. You need the exact left-to-right order. Statement one says P is to the left of Q. Statement two says R is to the left of P. Is either statement alone sufficient? Are both together sufficient?
Answer: Neither alone is sufficient; both together are sufficient. Statement one allows R to appear in more than one position while P remains left of Q. Statement two similarly leaves Q's position open. Together they form R before P before Q, giving the unique order R, P, Q.
Check your error: Finding one valid row from a statement is not enough to establish sufficiency. Look for a second valid row. For statement one, both P-Q-R and R-P-Q satisfy P before Q, so it does not fix the order. Sufficiency concerns whether the requested answer is determined, not whether you can construct an example.
Turn errors into a practice plan
After a short practice set, classify the reason for each error before doing another set. Useful categories include missed condition, incorrect representation, extra assumption, arithmetic slip and misunderstanding of the requested conclusion. Record the corrected explanation, not only the answer letter.
| Review field | What to record |
|---|---|
| Question task | What the question actually asked you to determine |
| Missed or changed condition | The instruction you overlooked or incorrectly added |
| Working representation | A row, diagram, category sketch or stated operation |
| Corrected explanation | Why the answer follows and alternatives fail |
| Next practice action | A similar task to check whether the repair holds |
Begin with a small set whose explanations you can inspect carefully. Rework an error without viewing the answer and then try a different problem using the same operation. Remembering one solution is different from understanding the method. If an answer key appears inconsistent, compare it with the stated conditions and investigate before memorising it.
Add timing after you understand the task
Use the actual examination's instructions to decide how timed practice should work. Check section timing, scoring, negative marking if applicable and navigation rules rather than assuming that every test uses the same conditions. Record how long different tasks take you and whether accuracy changes under time pressure. These observations describe your practice; they do not set a universal pass threshold.
Should I memorise every puzzle format?
Learn how to represent the stated conditions and check a solution. Familiar formats can help recognition, but a changed condition can make a memorised answer wrong.
Does a solved practice set prove exam readiness?
No. Check coverage, explanation quality and performance across relevant tasks. These six original exercises are a starting lesson, not a complete syllabus or readiness certificate.
What should I do next?
Choose one error category, practise it accurately and review a fresh example. Then compare your study coverage with the actual notice for your chosen examination.