In this guide
A mock test shows you, in 90 minutes, exactly where you lose marks. But only if you study it afterwards. It is easy to take forty mocks and improve very little: you look at the score, feel good or bad, and move on to the next one. Fifteen mocks, each studied properly, will teach you more.
This guide covers when to start, how many to take, and, most importantly, how to read a mock.
Three kinds of tests
| Type | Length | When | What it is for |
|---|---|---|---|
| Topic test | 10–20 questions | As soon as you finish a topic | Checks that the method has stuck |
| Section test | 20–30 questions | Once a section is about half done | Builds speed within one subject |
| Full mock | 100 questions, 90 minutes | Last six to eight weeks, plus one early as a baseline | Trains time, order and stamina |
Take one full mock in your first week, even if you have studied nothing. It is not a judgement. It shows you the paper, the screen and where you stand.
How many full mocks?
| Time before the exam | Full mocks |
|---|---|
| 2 months | One a week |
| 1 month | Two or three a week |
| Last 2 weeks | One every day or every other day |
That comes to roughly 15–25 full mocks. More is not better if you have no time left to analyse them.
Make it feel real
- Sit for the full 90 minutes without breaks or pausing the timer.
- Use a screen with a question palette, not a printed paper. The real CBT is on screen.
- Keep your phone in another room.
- Take the mock at the same time of day as your likely shift, once your exam city and shift are known.
- Do rough work on loose sheets, as in the exam hall.
A 30-minute check after every mock
- Write your right, wrong and skipped count for each section, and the time you spent on it.
- For every wrong answer, write one line on why it went wrong (see the table below).
- Look at the skipped questions. Could you have solved any in under a minute?
- Note which section took too long.
- Write three things to fix before the next mock. Only three.
A worked example
Suppose a candidate's mock looks like this. Each wrong answer costs ⅓ mark.
| Section | Attempted | Right | Wrong | Net marks | Time |
|---|---|---|---|---|---|
| Reasoning (30) | 27 | 24 | 3 | 24 − 1 = 23 | 25 min |
| Mathematics (25) | 20 | 15 | 5 | 15 − 1⅔ = 13⅓ | 30 min |
| General Science (25) | 22 | 17 | 5 | 17 − 1⅔ = 15⅓ | 20 min |
| General Awareness (20) | 15 | 10 | 5 | 10 − 1⅔ = 8⅓ | 10 min |
| Total | 84 | 66 | 18 | 66 − 6 = 60 | 85 min |
What the numbers say:
- Reasoning is strong: 24 of 27 right, about 89%.
- Maths is slow: 30 minutes for 20 attempts is 1.5 minutes each. Were the 5 wrong ones slips or wrong methods?
- General Awareness accuracy is only 10 of 15, about 67%. Some of those 15 were probably guesses. Attempting 11 with the same 10 right would score 10 − ⅓ = 9⅔ instead of 8⅓.
So the three fixes might be: daily calculation practice, re-learning one weak maths topic, and guessing less in GA. That is far more useful than "score 60, try harder".
Types of mistakes and their fixes
| Mistake | Example | Fix |
|---|---|---|
| Did not know | A science fact never studied | Add it to your notes; revise weekly |
| Wrong method | Used LCM where HCF was needed | Re-learn the topic, then do 15 questions on it |
| Calculation slip | 16 × 14 worked out as 234 instead of 224 | Ten minutes of mental maths daily |
| Misread | Missed "not" in the question | Read every question to the last word |
| Time pressure | Rushed the last 15 questions | Change the order in which you attempt sections |
| Blind guess | Picked an option with nothing ruled out | Follow the rules in our negative marking guide |
Count each type after five mocks. If most of your losses are slips and misreads, you don't need more study. You need slower, cleaner working.
Previous years' papers
Past RRB Group D papers are the best practice you can get:
- They show the real level of the exam, which many private mocks overshoot or undershoot.
- The same science facts and GA topics come back again and again in new wording.
- They show which maths topics are asked most in your cycle's pattern.
After each CBT, the RRBs have usually let candidates view their question paper, responses and the provisional answer key for a short objection window. Many publishers collect these into shift-wise sets. Solve them topic by topic first, then as full timed papers in the last month.
Choosing a mock series
- The level should match past papers. If every mock feels much harder than the real paper, the scores will only discourage you.
- Solutions should explain the method, not just give the option.
- The language should be the one you will take the exam in.
- Don't worry about the all-India rank a mock series gives you. Its test-takers are not the real exam crowd.
Keep a mock log
| Date | Science | Maths | Reasoning | GA | Total | Accuracy | Main mistakes |
|---|---|---|---|---|---|---|---|
After ten mocks, look down each column. The lowest column, or the one that is not moving, is where extra study will help most.
When scores stay low
- Early mocks are often low. That is normal.
- Compare only with your own earlier scores, not with a friend's or with toppers on social media.
- If scores stay flat for three weeks, take fewer mocks. Spend the freed time on analysis and on the one weakest topic.
- If your accuracy is below 75%, cut attempts first. Your score will usually rise straight away.
What to do next
- Take one full mock this week as a baseline.
- Start a mock log with section-wise right, wrong and time.
- Collect past papers and solve one section of them every day.
- In the last month, follow our last-month plan.
A note on dates and numbers. Exam patterns, vacancies and schedules change from year to year. Always confirm the current details in the latest notification on the Railway Recruitment Boards website .
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