Negative marking and normalisation in RRB Group D

Two rules decide your RRB Group D score: negative marking and normalisation. The first one you can control completely. The second one you cannot control at all. Candidates who understand both make calmer choices in the exam hall and waste less energy worrying afterwards.

How the marking works

The rule to remember: three wrong answers cancel one right answer. An unanswered question costs you nothing.

Worked example 1

A candidate attempts 75 questions: 66 right, 9 wrong.

• Right answers: 66
• Penalty: 9 × ⅓ = 3
• Raw score: 66 − 3 = 63

Worked example 2

Another candidate attempts 90 questions: 69 right, 21 wrong.

• Right answers: 69
• Penalty: 21 × ⅓ = 7
• Raw score: 69 − 7 = 62

The second candidate got three more answers right and still scored less. Fifteen extra attempts brought in only 3 more right answers and 12 more wrong ones.

Accuracy beats attempts

Accuracy is the share of your attempts that are correct: right ÷ attempted × 100. Look at what it does to four candidates.

The best score here comes from 70 careful attempts, not 90 hurried ones. More attempts help only while your accuracy stays high. Once you start answering questions you are unsure of, each extra attempt adds more risk than marks.

When does a guess help?

Each question has four options. Think about what happens on average over many guesses.

Put it in whole numbers. Suppose a candidate makes 12 blind guesses. On average 3 are right and 9 are wrong: 3 − 3 = 0. All that risk, for nothing. Now suppose the candidate makes 12 guesses after ruling out two options each time. On average 6 are right and 6 wrong: 6 − 2 = +4 marks.

So the question is never "should I guess?" It is "how many options can I honestly rule out?"

What "ruling out" looks like

• Maths: check the unit digit, or estimate. If 48 × 52 must end in 6, any option not ending in 6 is gone.
• Reasoning: test an option against the first clue of the puzzle. One contradiction removes it.
• Science: remove options from the wrong category. If the question asks for an acid, a base or a metal in the options is out.
• General Awareness: remove options that are clearly from a different state, sport or period.

Normalisation

The CBT is held in many shifts over several days, and each shift gets a different paper. One shift may be harder than another. To keep this fair, the RRBs convert each candidate's raw score into a normalised score using a formula published in the notice. Merit and cut-offs are then worked out on the normalised scores.

Broadly, the formula compares your marks with how candidates in your own shift performed, including the top scorers and the average, and places everyone on a common scale. The effect:

• In a harder shift, raw scores are usually adjusted up.
• In an easier shift, raw scores may be adjusted down.

For illustration only: a raw score of 60 in a tough shift may end up worth more than a raw 63 in an easy one.

What normalisation means for you

• If your paper felt hard, it was hard for everyone in your shift. Don't panic in the middle of the test.
• Your raw score may go up or down after normalisation. That is normal.
• You cannot change normalisation. You can change your accuracy.

Which questions to skip

Leave a question for later, or skip it, if:

• you cannot rule out even one option;
• the calculation will clearly take more than two minutes;
• you have read it twice and still don't understand what it asks.

Rules for the exam hall

1. Go through the paper once and answer everything you are sure of.
2. Mark doubtful questions for review instead of guessing on the first pass.
3. Read every question fully. Watch for "not", "incorrect" and "except".
4. On the second pass, rule out options before guessing. With two gone, answer. With none gone, leave it.
5. Don't change a confident answer without a clear reason.
6. Forget about other shifts. Your job is your own paper.

The CBT screen shows how each question is marked (answered, not answered, marked for review). Read the on-screen instructions on whether a question that is "answered and marked for review" is evaluated, and don't leave an answer you want counted in a doubtful state.

Try this in your next mock

Write "G" beside every guess on your rough sheet. After checking, count them.

• If fewer than a quarter of your guesses were right, they cost you marks. Guess less.
• If around a third were right, you are breaking about even. Rule out more before you guess.
• If half or more were right, your elimination is working. Keep doing it.

What to do next

• Work out your raw score and accuracy for your last three mocks.
• Set an accuracy target of 85% and track it in a mock log.
• Practise the two-pass method from our CBT strategy guide.
• Re-read the marking rules in the exam pattern guide and your CEN.