How to Attempt NDA Paper to Avoid Negative Marking?
Introduction
Every year at Alpha NDA Academy, we sit with our students before their NDA mock tests and ask them one simple question: “Do you know how many questions you should NOT attempt today?”
Most of them go quiet. Some say “as many as possible.” A few say “the ones I don’t know.” Very rarely does a student say the right thing.
And that silence right there is the reason why so many hardworking students lose 40 to 80 marks in a single paper not because they lack knowledge but because they do not know how to attempt the paper correctly.
Negative marking in NDA is not just a rule written in the UPSC notification. It is a trap that swallows the marks of students who study hard but attempt carelessly. We have seen students at our academy who knew the correct answer to 110 questions in a 120 question paper but still scored less than someone who attempted only 90 questions. That is what happens when you do not have a clear attempt strategy.
This guide is written for students preparing for NDA who are in Class 10, Class 11, or Class 12. We will walk you through the exact method we teach at Alpha NDA Academy so you can walk into the exam hall on the day of the NDA written exam with a clear plan and not just hope.
Before you read further, make sure you understand the basic structure of the NDA exam. Read our detailed guide on the NDA Exam Syllabus 2026 and the NDA Marking Scheme if you have not already. These two will give you the foundation to understand everything we are about to share.
Why Negative Marking in NDA Is More Dangerous Than You Think?
Let us start with the actual numbers because once you see them, you will never attempt the NDA paper carelessly again.
The NDA written exam has two papers:
Mathematics Paper
Total marks: 300 Total questions: 120 Time given: 2 hours 30 minutes (150 minutes) Marks per correct answer: 2.5 Marks deducted per wrong answer: 0.83 Time available per question: 75 seconds
General Ability Test or GAT Paper
Total marks: 600 Total questions: 150 Time given: 2 hours 30 minutes (150 minutes) Marks per correct answer: 4 Marks deducted per wrong answer: 1.33 Time available per question: 60 seconds
Now look at this real situation we have seen happen with students.
Student A and Student B sit for the same GAT paper.
Student A attempts 120 questions out of excitement. Out of those 120, he gets 75 correct and 45 wrong.
Score of Student A: (75 × 4) minus (45 × 1.33) = 300 minus 59.85 = 240.15 marks
Student B attempts only 90 questions with confidence. Out of those 90, he gets 78 correct and 12 wrong.
Score of Student B: (78 × 4) minus (12 × 1.33) = 312 minus 15.96 = 296.04 marks
Student B scored 296 marks. Student A scored only 240 marks. But Student A attempted 30 more questions.
This is the exact situation we see in our weekly mock tests at Alpha NDA Academy. Students who attempt more questions are not always the ones who score more. Students who attempt the right questions always score more.
The lesson here is simple. In NDA, every wrong answer you mark does not just give you zero. It actually takes marks away from the correct answers you already got right. That is what makes negative marking dangerous.
Understanding the Paper Before You Attempt It
Before we get into the strategy, you need to understand something important about how the NDA paper is set.
Both Mathematics and GAT are objective type papers with four options per question. You must shade one answer on the OMR sheet. If you shade more than one option for the same question, it is treated as a wrong answer and you lose marks.
There is also a sectional cutoff. This means you need to score at least 25 percent marks in the Mathematics paper separately and at least 25 percent marks in the GAT paper separately. In Mathematics that means you need at least 75 marks out of 300. In GAT that means you need at least 150 marks out of 600.
Even if you score 340 in total out of 900 but score only 60 in Mathematics, you will not qualify. The sectional cutoff applies regardless of your total score.
This means your attempt strategy must balance both papers, not just focus on one.
The Three Category Method: The Core of Smart Attempt Strategy
This is the single most important technique we teach our students at Alpha NDA Academy and it completely changes how they approach the exam.
When you pick up each question in the NDA paper, you must instantly put it into one of three categories before you even think about answering it.
Category 1: Full Confidence
You read the question. You know the concept. You can solve it in your head or within 60 to 90 seconds. You are at least 90 percent sure about your answer.
Action: Attempt this question immediately. Mark the answer on the OMR sheet directly.
Category 2: Partial Confidence
You read the question. You recognise the topic but you are not fully sure of the answer. You may be able to eliminate one or two wrong options but you cannot confidently pick the right one. You are somewhere between 40 and 75 percent sure.
Action: Circle the question number in your question paper. Skip it for now. Come back to it in the second round.
Category 3: No Confidence
You read the question. You have no idea what the topic is about, or you have never studied this concept properly, or you know the topic but have no clue what the answer might be. You are below 40 percent sure.
Action: Leave it completely. Do not mark anything on the OMR. Do not waste time on it. Move on.
This three category method is the foundation. Every question you face in the exam must go through this filter within the first 15 to 20 seconds of reading it.
The Two Round System: How to Actually Use the Paper
Now that you know the three categories, here is the exact approach to use in the exam hall.
Round One: Go Fast, Mark Only the Certain Answers
In Round One, you go through all 120 questions in Mathematics or all 150 questions in GAT at a steady pace. For every Category 1 question you encounter, you mark the answer directly on the OMR and move forward. For Category 2 and Category 3 questions, you circle them in the question paper and keep moving.
The goal in Round One is to collect all your guaranteed marks quickly. Do not slow down to think deeply about any question. If a question needs more than 30 seconds to even understand, skip it for now.
In our experience at Alpha NDA Academy, most students can collect between 55 and 70 confirmed correct answers just in Round One. That alone puts them in a very safe position before they even start Round Two.
Round Two: Visit Category 2 Questions Only
Once you finish Round One, check how much time you have left. Now go back only to the Category 2 questions you circled. These are questions where you have some idea and can use logic to narrow down the options.
For each Category 2 question, use the elimination method. If you can confidently eliminate two wrong options, your chances of getting it right go from 25 percent to 50 percent. A 50 percent chance in an exam with negative marking is borderline acceptable.
However, even in Round Two, if you cannot eliminate at least two options, leave the question. Do not guess purely based on instinct.
Category 3 Questions: Leave Them Always
Category 3 questions should never be attempted. Not even in Round Two. Not even if you have 20 minutes left and no other questions pending.
A question you have no knowledge about gives you only a 25 percent chance of being right. If you attempt 40 such questions, you will probably get 10 right and 30 wrong. In GAT, that means you gain 40 marks but lose 39.9 marks. Your net gain from 40 guesses is only 0.1 marks. But you wasted 40 minutes of time and lost the mental calmness needed for the questions you actually know.
Specific Strategy for the Mathematics Paper
Mathematics is where most students make the most impulsive attempts. They see a question, feel like they know it, start solving it midway and then realise they got stuck. By then, they have spent 3 to 4 minutes on a single question and have no idea whether to mark something or leave it blank.
Here is how we train students for the Mathematics paper specifically.
Know Your Strong and Weak Topics Before the Exam
At Alpha NDA Academy, we track every student’s topic wise performance through weekly mock tests. Before you enter the real exam, you should know exactly which topics you score well in consistently and which topics you often get wrong even after studying them.
Topics where your accuracy is above 80 percent are your safe zones. Topics where your accuracy is below 50 percent are zones you should be extremely cautious about, even if you think you know the concept.
For most students, topics like Trigonometry, Sets and Relations, and basic Algebra tend to be stronger. Topics like Integral Calculus and Matrices and Determinants can be tricky under exam pressure.
Solve in Your Head First, Then Mark
For Mathematics, never start writing the full solution and then check options. Instead, look at the four options first. Sometimes you can eliminate two or three options just by checking the unit, the sign of the answer, or the approximate magnitude. This saves time and also reduces errors.
If a question asks for an angle in degrees and two of the four options are negative numbers, you can eliminate those immediately. If the answer should clearly be a whole number and two options are fractions, you can narrow down immediately.
This option based thinking speeds up the paper considerably and also keeps your Category 2 questions more manageable.
Never Spend More Than 3 Minutes on One Question in Round One
If a Mathematics question is taking more than 3 minutes and you are not close to the answer, stop. Mark it as Category 2 and move on. Time lost on one question could have been used to secure marks in five easier questions.
To understand more about why Mathematics is difficult and how to handle it better, read our guide: Why NDA Maths Is Difficult for Students.
Specific Strategy for the GAT Paper
The GAT paper has 150 questions covering English, Physics, Chemistry, General Science, History, Geography, and Current Affairs. The variety is both an advantage and a risk.
The advantage is that you will definitely find sections you are strong in. The risk is that you may get overconfident in some sections and start attempting questions you are not fully sure about.
Attempt English Questions First
English questions in GAT are typically the most predictable. Grammar rules, vocabulary, comprehension and sentence correction are structured in a way that most well prepared students can answer confidently. Start with English in Round One to collect early marks and build momentum.
Know Subject Wise Accuracy
Just like in Mathematics, you should know before the exam which GAT subjects you score best in. History and Geography questions are often very factual. Either you know the fact or you do not. There is no partial knowledge. So for History and Geography, be very strict with the three category system. If you are not sure, skip it.
Physics and Chemistry questions are more concept based. Sometimes you can work backwards from options. This makes them slightly more manageable as Category 2 questions.
Current Affairs questions depend entirely on preparation. If you have been reading about defence related news, scientific events, and national developments regularly, these will be your strength. If you have not prepared Current Affairs at all, they will be pure Category 3 questions. Do not guess them.
In GAT, 1.33 Marks Per Wrong Answer Is Serious
We want students to truly understand what 1.33 marks means. If you guess 30 questions in GAT and get 10 right and 20 wrong, here is the math:
Correct: 10 questions × 4 marks = 40 marks gained Wrong: 20 questions × 1.33 marks = 26.6 marks lost Net gain from 30 guesses: 40 minus 26.6 = 13.4 marks
So after taking the risk of guessing 30 questions and spending maybe 20 to 25 minutes on them, you only gained 13.4 marks. But if instead you had spent those 20 minutes revising and then attempted 10 more questions you were actually confident about, you would have gained 40 marks without any deduction.
This is the math of why random guessing is never worth it in NDA.
To understand the complete marking structure in detail, read our blog: NDA Marking Scheme Explained.
Also read our guide on the NDA GAT Syllabus Explained to understand which sections carry more weight and where to invest your preparation time.
The Elimination Method: How to Use It Correctly
The elimination method is a legitimate strategy in multiple choice exams. But in NDA, it must be used carefully.
Here is how to use it without increasing your risk:
Step One: Read all four options before deciding anything
Never mark an answer after reading just the first option that seems right. Sometimes UPSC puts a very convincing wrong option as the first choice specifically to trap students who rush.
Step Two: Look for clearly wrong options first
Ask yourself: which of these four options is definitely not the answer? Cross it out mentally. Then look at the remaining three. Is there another one you can definitely eliminate? Cross that one too.
Step Three: Decide based on what is left
If you are down to two options and both seem possible, think about the concept. If you still cannot decide, leave the question. Getting it right by 50 percent chance is not worth the 1.33 mark deduction if you get it wrong.
If you are down to one option after eliminating three, mark it with confidence. You effectively know the answer through elimination.
When NOT to use elimination:
Do not use the elimination method in Mathematics where numerical values are involved. Eliminating wrong numbers is different from knowing the right calculation. In Math, if you cannot arrive at the correct calculation, do not mark just because the other three options look less likely.
Common Mistakes That Cost Students the Most Marks
We see the same mistakes in our mock tests at Alpha NDA Academy week after week. Knowing these mistakes is half the solution.
Mistake One: Reading the question quickly and assuming you know the answer
A lot of students read a question in 5 seconds and immediately shade an option because the topic looks familiar. But NDA questions often have a small twist in the wording that changes the answer completely. Never assume. Read the full question carefully before categorising it.
Mistake Two: Marking on the OMR while still unsure
Some students mark on the OMR first and then decide to change their mind. Changing answers on OMR is allowed but erasure marks can sometimes confuse the OMR scanner. More importantly, marking something and then reconsidering wastes double the time. Decide first, then mark.
Mistake Three: Rushing in the last 20 minutes
We have seen students who managed the first 2 hours perfectly and then panicked in the final 20 minutes and marked 25 random guesses out of fear of leaving questions unanswered. That single burst of guessing wiped out their entire performance.
In NDA, it is not just acceptable to leave questions unattempted. It is smart. There is no penalty for skipping. The penalty is only for wrong answers.
Mistake Four: Not reviewing the OMR before submitting
In both papers, keep 5 to 8 minutes at the end to check your OMR sheet. Confirm that you have not accidentally shaded the wrong bubble for a question you knew. Check that every question you intended to skip is genuinely blank and you did not accidentally mark it.
Mistake Five: Attempting questions from a topic they just revised the night before
This is very common with our newer students. They study a topic the night before the exam, feel overconfident about it the next day, and attempt questions from that topic even when they are not fully sure. Night before preparation does not translate to exam hall accuracy. Stick to topics you have practised consistently over weeks.
Time Management and Attempt Strategy Together
Attempt strategy and time management must work together. One without the other is incomplete.
Here is a suggested time plan for both papers:
For Mathematics (150 minutes, 120 questions):
Round One: 90 minutes. Go through all 120 questions. Mark only Category 1 answers. Average 45 seconds per question for the quick ones.
Round Two: 40 minutes. Revisit Category 2 questions. Use elimination and apply deeper thinking.
OMR Review: 10 minutes. Check all shaded answers on the OMR sheet carefully.
If you find that Round One is taking more than 90 minutes, you are spending too long per question. Practice speed through regular timed mock tests.
For GAT (150 minutes, 150 questions):
Round One: 80 minutes. Go through all 150 questions at roughly 32 seconds each. Mark all Category 1 answers.
Round Two: 55 minutes. Revisit Category 2 questions. Use subject knowledge and elimination.
OMR Review: 15 minutes. GAT is longer so OMR review needs more time. Check carefully.
These time plans work best when students have already practised them consistently before the actual exam. If you walk into the NDA exam using this plan for the first time, the pressure of the real exam will make it harder to follow. Practice is everything.
How to Practice This Strategy at Home?
Knowing the strategy is one thing. Building it into your muscle memory before the exam is what actually matters.
Here is how to practice this systematically:
Solve every practice paper under full timed conditions
Sit in a quiet room. Set a timer for exactly 2 hours 30 minutes. Do not pause. Do not check answers in between. Treat every practice session like the actual exam. This builds the mental stamina you need on the real day.
Mark your questions into three categories as you solve the practice paper
Use a pencil to write a small tick for Category 1, a small circle for Category 2, and an X for Category 3 on the question paper itself. After the test, count how many of each you had. Over time, you should see your Category 1 count going up and your Category 3 count going down.
After each practice test, analyse your accuracy per category
If you got your Category 1 questions mostly wrong, that is a warning sign. It means your confidence calibration is off. You think you know things you actually do not know. That is a topic knowledge problem to fix.
If you got Category 2 questions mostly wrong even after using elimination, it means you need to improve your elimination skills and stop attempting these without clearer reasoning.
Track your net score, not just your attempt count
After every mock test, record your correct answers, wrong answers, unattempted questions, and net score. Over weeks, you will see patterns. If your net score is lower than your correct answer count suggests, negative marking is eating your performance.
How Alpha NDA Academy Prepares Students for This?
At Alpha NDA Academy in Sikar, Rajasthan, we do not just give students content to study. We teach them how to think inside the exam hall.
Every Saturday, our students write a full NDA mock test of 900 marks in exam conditions with proper OMR sheets, timed strictly, and invigilated. After each test, our faculty sits with students individually to analyse their attempt pattern. We look at which questions were attempted, which were skipped, and whether the strategy matched what we have trained them to do.
We also track something very specific: the ratio of correct to wrong answers in each paper. A student who gets 90 correct and 30 wrong scores significantly less than a student who gets 85 correct and only 5 wrong. We make students see this difference clearly through real data from their own test reports.
These reports are also sent to parents every week. So families can see not just the score but also whether their child is improving in accuracy and strategy, not just in syllabus coverage.
We have found that students who follow this approach consistently for four to five months see their written exam scores go up by 60 to 80 marks just by improving their attempt strategy, without studying any additional topics. That is the power of knowing how to attempt the paper correctly.
If you want to understand the full preparation journey and what goes into cracking the NDA written exam, read our complete guide: NDA Preparation Tips 2026.
What to Do on the Day Before and the Day of the Exam?
Night Before the Exam
Do not study new topics. You will not retain them, and the overconfidence of reading something fresh can push you into wrong attempts during the exam.
Instead, revise your notes of topics you are already strong in. Solve 10 to 15 questions from your best topics just to stay warm. Sleep by 10 PM. A rested brain makes better decisions under pressure.
Morning of the Exam
Eat a light breakfast. Reach the exam centre at least 30 to 40 minutes early. Rushing into the exam hall raises your anxiety and affects your first 20 to 30 minutes of performance.
Inside the Exam Hall
Read the instructions on the OMR sheet carefully. Do not rush to open the question booklet the moment they say start. Take 30 seconds to calm yourself, adjust your posture, and remind yourself of the strategy you have practiced.
Frequently Asked Questions
Is it better to leave questions unattempted in NDA?
– Yes, absolutely. Leaving a question blank gives you zero marks. Marking it wrong gives you negative marks. If you are not confident, leaving it blank is always the safer option. There is no shame or penalty in skipping questions you do not know.
How many questions should I attempt in NDA to be safe?
– There is no fixed number. It depends on your accuracy. A student who attempts 80 questions with 90 percent accuracy will score more than a student who attempts 120 questions with 65 percent accuracy. Focus on accuracy over quantity.
Can I change my answer on the OMR sheet?
– Technically the OMR sheet can be corrected with erasure but we strongly advise against this. Use your question paper to make your decision before marking the OMR. Only mark the OMR when you are sure.
What if I run out of time and many questions are unattempted?
– This is fine. Do not panic and start randomly filling answers in the last 5 minutes. Empty bubbles are safe. Rushed guesses are dangerous. Stay calm and submit the paper as it is.
Does the negative marking rule apply if I mark two options for the same question?
– Yes. Marking two options for the same question is treated as a wrong answer and the negative marking deduction applies. Always shade only one bubble per question.
Is negative marking the same for both papers?
– No. In the Mathematics paper, each wrong answer costs 0.83 marks. In the GAT paper, each wrong answer costs 1.33 marks. The GAT deduction is higher because each correct answer in GAT is also worth more (4 marks versus 2.5 marks in Mathematics).
How do I know if my attempt strategy is improving?
– Track your score, attempt count, correct count, and wrong count after every mock test. If over four to five weeks your net score is going up while your wrong answers are going down, your strategy is improving.
Conclusion
Negative marking in NDA is not something to fear. It is something to prepare for.
The students who clear the NDA written exam are not always the ones who know the most. They are the ones who know how to use what they know in the most efficient way possible. The three category system, the two round approach, and a calm disciplined mindset in the exam hall are skills that can be trained just like any other skill.
We have seen this transformation happen time and again at Alpha NDA Academy. A student who came to us scoring 220 in written mock tests begins to score 310 or 320 not because they studied 10 new chapters but because they stopped attempting questions they were not sure about and started trusting the process.
That is the real secret behind our 90 percent written selection rate. Not just hard work. Smart work combined with a clear plan for the exam hall.
