NDA Negative Marking: Marks Deduction and Safe Attempt Strategy

In the NDA written exam, wrong answers cost you marks. You lose 0.83 marks for every wrong answer in Mathematics and 1.33 marks for every wrong answer in the General Ability Test (GAT). There is no penalty for leaving a question blank. The safe rule is simple: only attempt a question if you can rule out at least two wrong options. Guess blindly, and negative marking can quietly eat into a good score.

Negative marking decides more candidates' fate than most people realise. Two students can know the same amount of Maths, but the one who guesses less often almost always scores higher. This guide explains exactly how NDA negative marking works, how much you lose per wrong answer, and how to build an attempt strategy that protects your score instead of shrinking it.

What Is Negative Marking in the NDA Exam?

Negative marking means marks are cut from your score for every wrong answer. UPSC uses this system in the NDA exam to stop random guessing. If there were no penalty, everyone would answer every question, hoping some guesses turn out right. Negative marking forces you to think before you mark an answer.

Here is the part many students miss: the penalty is not the same for both papers. Mathematics and GAT have different marks per question, so the negative marking amount is also different.

NDA Negative Marking Scheme

A few points to remember:

• The deduction is always one-third of the marks given for a correct answer.

• Mathematics: +2.5 for correct, so one-third of that is about −0.83 for wrong.

• GAT: +4 for correct, so one-third of that is about −1.33 for wrong.

• Unattempted (blank) questions get zero marks, no penalty at all.

• Marking more than one option for a question is treated as a wrong answer, and the same deduction applies.

This scheme has stayed the same for many years, and it is expected to continue for NDA 1 2027 as well.

Why Does UPSC Use Negative Marking?

The exam is not just testing what you know. It is also testing how well you make decisions under pressure , a skill every defence officer needs. UPSC wants to filter out candidates who mark answers on luck rather than knowledge. This is also why the SSB interview later checks for calm, sensible decision-making, not just book knowledge.

For you as a candidate, this means one thing: accuracy matters more than the number of questions you attempt.

How Much Can Negative Marking Actually Cost You?

Let's look at real numbers so this feels less abstract.

Example 1 — Mathematics
Suppose you attempt 80 questions. You get 60 correct and 20 wrong.

• Marks from correct answers: 60 × 2.5 = 150

• Marks lost from wrong answers: 20 × 0.83 = 16.6

• Final score: 150 − 16.6 = 133.4 out of 300

If you had left those 20 doubtful questions blank instead of guessing, and only 5 of them would have been correct anyway, here is what happens:

• Marks from correct answers: 65 × 2.5 = 162.5

• Marks lost: 0 (since the rest are left blank)

• Final score: 162.5 out of 300

That is nearly 30 marks more, simply by not guessing on questions you were unsure about.

Example 2 — GAT
Say you attempt 120 out of 150 questions. You get 90 correct and 30 wrong.

• Marks from correct answers: 90 × 4 = 360

• Marks lost: 30 × 1.33 = 39.9

• Final score: 360 − 39.9 = 320.1 out of 600

Now imagine 10 of those 30 wrong answers were random guesses with no real elimination done. Skipping just those 10 would have saved 13.3 marks enough to change your final rank in a close cut-off year.

This is the real danger of negative marking. It does not fail you in one big blow. It quietly nibbles away marks, question by question, until your score is much lower than what you actually know.

Safe Attempt Strategy for NDA

You don't need to be a genius to beat negative marking. You need a simple system you follow every single time you sit for a mock test or the real exam.

1. Sort questions into three buckets

As you go through the paper, mentally place each question into one of these:

• Sure shot – you know the answer. Attempt it immediately.

• Can eliminate 2 or more options – attempt it. The odds are now in your favour.

• Total guess – leave it blank. No exceptions.

2. Use the "one-third rule" to check if a guess is worth it

If you can confidently remove at least two of the four options, your chance of getting it right becomes 50% or higher. At that point, the expected gain is greater than the expected loss, so attempting the question is a smart risk, not a blind guess.

If you can only remove one option, or none, the odds are against you. Skip it.

3. Know your "good attempt" range

Based on past exam trends, here is a rough target for a safe, well-balanced attempt:

Attempting fewer questions with high accuracy will almost always beat attempting more questions with low accuracy.

4. Attempt easy sections first

In GAT, English and simple GK questions take less time and carry lower risk than tricky Physics or Maths-based reasoning questions. Clear these first to bank safe marks, then use remaining time on tougher questions.

5. Don't let the clock push you into guessing

Most wrong guesses happen in the last 15–20 minutes, when candidates panic about unattempted questions. Keep a fixed cut-off time (say, the last 10 minutes) only for review, not for rushed new attempts.

6. Revise, don't second-guess

If you have time left, use it to recheck calculation questions in Maths. Do not go back and change GAT answers based on doubt alone your first instinct is usually more reliable than a last-minute change made out of anxiety.

Common Mistakes That Increase Negative Marking Loss

• Attempting a question just because you spent a lot of time on it, even after failing to solve it.

• Guessing on GAT General Knowledge questions with no elimination at all.

• Changing correct first answers due to exam-hall pressure.

• Ignoring the sectional cut-off requirement of 25% marks in each paper, which can disqualify you even with a good overall score.

• Treating every blank question as a "lost mark" ,it is not. A blank question costs nothing.

Final Word

Negative marking is not something to fear. It is something to plan for. The candidates who clear NDA year after year are not always the ones who know the most  they are often the ones who make the fewest careless guesses. Build your accuracy first, then let your attempt number grow naturally as your preparation improves.

FAQ

How much negative marking is there in NDA Maths?
0.83 marks are deducted for every wrong answer in Mathematics.

How much negative marking is there in NDA GAT?
1.33 marks are deducted for every wrong answer in the General Ability Test.

Is there any penalty for leaving a question blank in NDA?
No. Unattempted questions carry zero marks — no marks are added or deducted.

What happens if I mark two answers for one question?
It is treated as a wrong answer, and the standard negative marking deduction applies.

How many questions should I safely attempt in NDA?
Around 60–75 in Mathematics and 90–110 in GAT, with high accuracy, is a safe and commonly recommended range.