RRB Group D Course

RRB Group D: The Posts, the Single-Stage CBT, the Physical Efficiency Test and a Preparation Strategy

Group D recruitment is built around a single computer-based test, not two. That one fact changes how you should prepare compared with a two-stage exam: there is no low-stakes screening round to learn the interface on, so the first CBT you sit is also the one that decides your merit. CEN 09/2025, the Centralised Employment Notification that governs the current Level-1 recruitment cycle, states this directly: "The exam shall be a single stage Computer Based Test (CBT)," with Railway Administration reserving the right to add a second stage only if it later decides to. After the CBT comes a Physical Efficiency Test that most other Railway exams do not have, then Document Verification and a medical examination. This chapter reads CEN 09/2025 directly — not a coaching summary of it — and turns its numbers into decisions: how many marks you need for your category, when a guess is worth making under a one-third penalty, what pace the PET actually demands in kilometres per hour, and how to divide your remaining preparation time across the chapters that follow. Every pattern figure below is cited to the page of the notification it comes from. Where the notification does not give a number — your own post's educational qualification, for instance — this chapter says so and tells you exactly which annexure to open instead of guessing on your behalf.

KarmSakha preparation topics covered

• What 'Group D' covers under CEN 09/2025: Level-1 posts across departments, and the order of the recruitment chain
• The Computer Based Test: 100 questions in 90 minutes, split General Science 25, Mathematics 25, General Intelligence and Reasoning 30, General Awareness and Current Affairs 20
• Negative marking of one-third of a mark per wrong answer, and the arithmetic of when a guess helps
• Minimum qualifying percentage by community, and how normalisation works across CBT sessions
• The Physical Efficiency Test: a timed weight-carry followed by a timed run, different standards for male and female candidates
• Age band, pay level, medical standards and why educational qualification is post-specific, not one figure for all of Group D
• Shortlisting ratios from CBT to PET to Document Verification, and what Document Verification actually checks
• Building a time budget for the CBT and a study plan that maps onto the rest of this book

What Group D Covers, and the Order of the Recruitment Chain

CEN 09/2025 is titled “Recruitment for Various Posts in Level 1 of 7th CPC Pay Matrix,” and it is what most aspirants mean when they say “RRB Group D.” It is a single, common notification issued on behalf of every zonal Railway Recruitment Board and covers many Level-1 posts across departments — track maintenance, the electrical and mechanical workshops, signal and telecommunication (S&T) maintenance, points and signalling on the running line, and general departmental helper roles, among others. The notification itself does not print one single job title called “Group D”; it prints a Post Parameter table in its Annexure-A, and the pay level, medical standard and educational qualification differ post by post inside that table. Treat this chapter's description of the process — the CBT, the PET, Document Verification — as common to every post under the CEN, and treat anything post-specific (which qualification, which medical standard) as something you must confirm from your own post's row rather than from a general summary, including this one.

The recruitment chain has four stages in a fixed order: the Computer Based Test, the Physical Efficiency Test, Document Verification, and a Medical Examination. Each stage gates the next — you cannot skip the PET because you scored well in the CBT, and Document Verification is not a formality but the point at which your original certificates are checked against everything you declared online. The notification is explicit that admission to every stage is “purely provisional,” meaning a call letter for PET or DV is not an offer of any kind — it only means you have cleared the previous filter and are being tested against the next one.

One structural fact matters more for Group D than for most other Railway exams: this is a single-stage CBT, not two. RRB NTPC, by contrast, runs a 1st Stage CBT that only screens candidates for a 2nd Stage CBT that alone decides merit. Group D has no such low-stakes first pass. Every question you answer in the one CBT you sit counts directly toward your shortlisting for the PET and, ultimately, toward your final merit. There is no round in which you can afford to treat the paper as practice.

The CBT: 100 Questions, 90 Minutes, Four Sections

CEN 09/2025 prints the CBT scheme as a single table, and it is worth memorising exactly as written, because every time-budgeting and negative-marking decision in this chapter is built on it. The exam runs for 90 minutes (120 minutes for a candidate eligible to use a scribe) and carries 100 questions of one mark each: General Science 25, Mathematics 25, General Intelligence and Reasoning 30, General Awareness and Current Affairs 20. The notification adds an important qualifier immediately after the table: “The section wise distribution given in the above table is only indicative and there may be some variation in the actual question paper.” Do not read the 25/25/30/20 split as a promise you can bank on question-for-question; read it as the planning figure it is meant to be.

Two things separate Group D's CBT from most other Railway papers you may have heard about. First, General Science is a dedicated 25-mark section here, tested at “Physics, Chemistry and Life Sciences of 10th standard (CBSE) level,” which is a heavier and more explicit science weight than RRB NTPC gives the subject. Second, General Intelligence and Reasoning is the single largest section at 30 marks, ahead of both Mathematics and General Science individually. A study plan that spends most of its hours on Mathematics because that is the traditionally “scary” subject, while treating reasoning as something that can be picked up in the last fortnight, is misreading where the marks actually sit.

All 100 questions are objective, multiple-choice, and available in English, Hindi and thirteen regional languages (Assamese, Bengali, Gujarati, Kannada, Konkani, Malayalam, Manipuri, Marathi, Odia, Punjabi, Tamil, Telugu and Urdu). CEN 09/2025 states that every question is displayed in your opted language together with English on the same screen, so a confusing translation can be checked against the English text without losing time switching screens. Separately, the notification's own general interpretation clause treats the English version of the CEN document itself as final in any dispute — a second, independent reason to keep at least a working vocabulary of the English technical terms for whichever subject you find hardest, even if you plan to attempt the paper in your own language.

Negative Marking: The Arithmetic of When a Guess Helps

CEN 09/2025 states the rule in one sentence: “There will be negative marking and 1/3 marks shall be deducted for each wrong answer.” Since every question is worth one mark, that means each wrong answer costs you exactly one-third of a mark, an unattempted question costs nothing, and a correct answer earns the full mark. Your net score for the paper is the count of correct answers minus one-third of the count of wrong answers — unattempted questions do not enter the formula at all.

This is where most aspirants either over-guess out of anxiety or under-guess out of fear of the penalty, and both are avoidable with one calculation. Suppose you have narrowed a question down to k equally likely options out of the original four, and you guess uniformly among them. Your expected gain is 1/k (the chance you are right, times the one mark you win) minus (k−1)/(3k) (the chance you are wrong, times the one-third mark you lose). Simplifying that expression gives (4−k)/(3k) marks per guess. Put a candidate's four possible situations into that formula and the pattern is unambiguous: a completely blind guess among all four options (k = 4) has an expected value of exactly zero — it is a coin flip on your score, neither help nor harm on average, not the guaranteed loss some coaching folklore claims. The moment you can honestly eliminate even one wrong option, k drops to 3 and the expected value turns positive; eliminate two and it climbs further.

The practical rule that falls out of this arithmetic: never guess on a question where you cannot eliminate anything and you are also short on time, because the expected value is zero and the guess still costs you the handful of seconds you needed to read it — time has its own opportunity cost that the marks formula alone does not capture. But once you can eliminate even a single option through actual reasoning — not a hunch, but a fact you are sure rules an option out — always guess among what is left, because the expected value is now strictly in your favour. This distinction, between a blind guess and an informed one, is the entire difference between negative marking hurting you and negative marking being irrelevant to a prepared candidate.

Minimum Qualifying Percentage, and How Normalisation Works

Scoring well is not, by itself, enough — CEN 09/2025 also sets a minimum percentage of marks a candidate must cross to be considered for shortlisting at all, and this minimum is different for different communities. The figures are: UR 40%, EWS 40%, OBC (Non-Creamy Layer) 30%, SC 30%, ST 30%. On a 100-mark paper these translate directly into raw marks — 40 for UR and EWS, 30 for OBC-NCL, SC and ST — and the notification adds that this threshold is relaxed by 2 marks for PwBD candidates specifically in case of a shortage of PwBD candidates against the vacancies reserved for them, not as a blanket relaxation available to every PwBD applicant regardless of vacancy position.

A second mechanism sits underneath these percentages and is easy to miss: normalisation. When a CBT is conducted across multiple sessions (which, for a paper sat by lakhs of candidates, it almost always is), the raw marks a candidate scores in an easier or harder shift are adjusted relative to the other shifts so that the comparison across all candidates stays fair. The notification states plainly that “short listing of candidates for various stages shall be based on the normalized marks obtained by them whenever CBT is conducted in multiple sessions for the same syllabus,” without publishing the exact formula used to do it. That omission is deliberate on the notification's part, and this book will not invent a formula in its place. What normalisation means for your preparation is simple: a harder shift is not a personal misfortune that permanently damages your result, because your score is compared against people who sat the same shift as you, not against everyone who sat any shift. The response to a difficult paper is steady accuracy, not panic.