NISM Series VIII Negative Marking and Guessing Strategy
0.25 marks come off for every wrong answer on a 100-mark paper. That changes when guessing pays and when it does not.
Series VIII deducts 0.25 marks for every wrong answer. A correct answer earns 1. That ratio is the whole of the strategy, and most candidates read it backwards: they treat the penalty as a reason to leave questions blank, when the arithmetic says the opposite.
A blank scores zero. A wrong answer scores minus 0.25. The question is never whether a penalty exists, it is whether your chance of being right is good enough to beat zero. On a four-option question it usually is.
What each decision is worth
Expected marks from one question, given how many options you can confidently rule out. A four-option MCQ, 1 mark correct, 0.25 deducted for wrong:
Leave it blank
Chance of being right
0
Expected marks
0.00
Blind guess, nothing eliminated
Chance of being right
1 in 4
Expected marks
+0.06
One option eliminated
Chance of being right
1 in 3
Expected marks
+0.17
Two options eliminated
Chance of being right
1 in 2
Expected marks
+0.38
You know it
Chance of being right
Certain
Expected marks
+1.00
| Your position | Chance of being right | Expected marks |
|---|---|---|
| Leave it blank | 0 | 0.00 |
| Blind guess, nothing eliminated | 1 in 4 | +0.06 |
| One option eliminated | 1 in 3 | +0.17 |
| Two options eliminated | 1 in 2 | +0.38 |
| You know it | Certain | +1.00 |
Why every row beats leaving it blank
Take the blind guess. One time in four you gain a full mark. Three times in four you lose a quarter of one. Over four such questions that is one mark gained against 0.75 lost, a net gain of 0.25 marks. Small, but positive, and it compounds across a paper of 100 questions.
Eliminate a single option and the gain roughly triples. Eliminate two and you are earning more than a third of a mark per question, every time you do it.
This is a property of the 0.25 penalty specifically. An exam that deducted a full mark per wrong answer would invert the entire table and make blank the correct default. Series VIII is not that exam.
The real constraint is the clock
100 questions in 120 minutes leaves about 72 seconds each. The cost of a hard question is almost never the 0.25 you might lose, it is the four minutes you spend deciding, which quietly removes three easier questions from your reach. Skip on time, not on fear.
Free questions, scored the way the exam scores them.
How to run the paper
The order matters more than the guessing rule, because it protects the marks you are certain of before you spend anything on the marks you are not:
- 1
First pass: answer only what you know
Go start to finish and take every question you can settle in under a minute. Do not stop to fight anything. Flag the rest and keep moving. You are banking certain marks before the clock gets expensive.
- 2
Second pass: work the flagged questions
Come back with a known time budget. These are the questions where elimination pays, and where the payoff calculations and margin numericals reward the working you skipped the first time.
- 3
Third pass: answer everything still blank
With minutes left, fill in every remaining question. By then the table above applies in full: a blind guess is worth more than a blank, and there is no longer any time cost to spending it.
Where this paper punishes guessing anyway
The arithmetic holds across the paper, but some question types make your guesses worse than random, which is a different problem:
- check_circlePayoff questions attempted from memory. Sign errors on short positions feel like knowledge and are not, so a confident wrong answer costs the same 0.25 as a coin flip.
- check_circlePremium, cost of carry and margin numericals where you recognise the formula but have not executed it under time pressure.
- check_circleQuestions where two options differ by a single word. Read both fully before eliminating, because a fast elimination here is often the wrong one.
- check_circleAnything in the regulation chapters read three weeks ago and not revisited. Stale recall produces confident errors.
What you are aiming at
You need 60 marks out of 100 to pass, and the certificate is valid for 3 years. The reported pass rate sits around 72%, which puts Series VIII in the middle of the NISM range: harder than Series V-A, easier than Series XV.
Nothing in the guessing strategy substitutes for knowing the options chapters. It is worth a handful of marks at the margin, which matters only if your preparation has already carried you close to 60.
Common questions
How much is deducted for a wrong answer in NISM Series VIII?expand_more
0.25 marks per wrong answer, against 1 mark for a correct one, on a 100-mark paper. You need 60 marks to pass.
Is there any penalty for leaving a question unanswered?expand_more
No. An unanswered question scores zero, neither gaining nor losing marks. That is exactly why guessing is worth considering: you are comparing a small expected gain against nothing, not against a safe positive.
Should I guess if I have no idea at all?expand_more
On a four-option question, a blind guess has a slightly positive expected value at this penalty rate: about +0.06 marks. It is worth doing at the end of the paper, once it costs you no time. It is not worth doing mid-paper if the decision itself eats minutes.
Does eliminating one option really change much?expand_more
Yes. Ruling out a single option moves the expected value from about +0.06 to about +0.17 marks, roughly three times better. Elimination is where the marks are, not the guess itself.
How long do I get, and how many questions are there?expand_more
120 minutes for 100 questions, which is about 72 seconds each. The pacing, rather than the negative marking, is what most candidates actually run out of.