NISM Series XV 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 XV deducts 0.25 marks for a wrong answer and awards 1 for a correct one. Candidates treat that penalty as a reason to leave hard questions untouched. On a four-option paper it is not, and the arithmetic is worth doing once properly.
A blank is worth exactly zero. The only question that matters is whether your odds beat zero, and across 15 chapters of material there are very few questions where they genuinely do not.
What each decision is worth
Expected marks from a single question, by how many options you can rule out. Four options, 1 mark for 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 |
The reasoning behind the table
Across four blind guesses you expect one correct answer worth a full mark, and three wrong ones costing 0.75 between them. Net, a quarter of a mark gained for every four questions guessed. Modest, and positive.
Ruling out one option roughly triples that. Ruling out two more than doubles it again. The value sits in the elimination, not in the guess, which is why this is a knowledge strategy rather than a gambling one.
The conclusion depends entirely on the penalty being 0.25. At a full mark per error the table would invert and blanks would become correct. Series XV is not scored that way.
Time is the scarce resource, not marks
100 questions in 120 minutes is roughly 72 seconds each. A question you wrestle with for four minutes has not cost you 0.25 marks, it has cost you the three easier questions you never reached. Decide to move on based on the clock, not on the penalty.
Free questions, scored the way the exam scores them.
How to run the paper
Three passes, so that certain marks are banked before uncertain ones are paid for:
- 1
First pass: take everything you know
Straight through, answering only what resolves in under a minute. Flag the rest and keep moving. Across 15 chapters there is always more easy material further down the paper than you expect.
- 2
Second pass: work the flagged questions
Return with a known time budget. This is where elimination earns its keep, and where the valuation and ratio numericals reward actually working them rather than recognising the shape of the formula.
- 3
Third pass: leave nothing blank
In the closing minutes, answer every remaining question. At that point a guess costs no time, and the table above says it beats a blank.
Where a Series XV guess goes wrong
The penalty is uniform, but these question types reliably produce confident errors, which cost the same as a coin flip:
- check_circleValuation numericals where the method is remembered but the inputs are misread. Discounting and multiples questions punish a rushed read more than a weak concept.
- check_circleRatio and financial statement questions where two options are the same number derived differently. Eliminating fast here usually eliminates the right one.
- check_circleRegulation and code of conduct items covering the SEBI Research Analyst framework, read early in preparation and not revisited. Stale recall feels like knowledge.
- check_circleQuestions distinguishing what a research analyst may do from what requires a different registration. The options are written to be close together on purpose.
What you are aiming at
The pass mark is 60 out of 100 and the certificate holds for 3 years. The reported pass rate is around 68%, the lowest of the NISM modules covered here, which is a function of the 15 chapters rather than any single hard topic.
Guessing strategy is worth a few marks at the boundary. It rescues a paper that was already close to 60 and does nothing for one that was not.
Common questions
How much is deducted for a wrong answer in NISM Series XV?expand_more
0.25 marks per wrong answer against 1 mark for a correct one, on a 100-mark paper. The pass mark is 60.
Is a blank answer penalised?expand_more
No. Unanswered questions score zero. That is the comparison that matters: a guess is being measured against nothing, not against a safe positive score.
Is guessing worth it on the Research Analyst exam?expand_more
At this penalty rate a blind four-option guess is worth about +0.06 marks, so it is slightly better than a blank. Do it at the end of the paper when it costs no time, and rely on elimination rather than pure guessing whenever you can.
Why is Series XV considered harder than other NISM modules?expand_more
Its reported pass rate is around 68%, and the syllabus runs to 15 chapters against 6 to 9 for most other modules. The difficulty is breadth of coverage, not a single hard subject.
How much time do I get per question?expand_more
120 minutes for 100 questions, about 72 seconds each. Pacing across 15 chapters is the common failure, ahead of negative marking.