UPSC Prelims 2022 Solved: Common-Sense Elimination Tricks

This is the final part of Neil Sir's Sherlocking Prelims 2022 analysis series, where he solves questions 91 to 100 of the UPSC Prelims 2022 GS paper (Set A) and finally reveals his probabilistic bundling technique. The focus is not on memorising more facts but on two pillars - basic sources plus common sense, and working from an overview rather than deep detail - so you can confidently eliminate wrong options inside the exam hall. As Neil Sir stresses, watching alone is not enough; the real toolkit comes from practising these heuristics over real previous-year questions from 2011 onwards.

Key takeaways

• Two pillars drive every decision: a thorough grip on basic sources combined with common sense, and an overview of topics rather than in-depth detail - because too much knowledge often paralyses you in a 50-50.
• Extreme words such as "any", "no reference", "wholly authoritative" or "do not exist" usually signal an incorrect statement; soft, generic words like "some" usually signal a correct one.
• When two options look similar (both about salvation, both saying "protect the body from"), the answer is very likely one of those two.
• In a list of names, the most prominent figure - Akbar the Great, Ashoka the Great - is often the intended answer.
• If there is no "all of the above" option in a multi-statement question, at least one and at most two statements must be wrong.
• Probabilistic bundling: group the "how many pairs match" questions and mark the same middle option, since the bell curve makes two or three correct pairs the most likely - but use it only with a high risk appetite.
• Neil Sir's prediction: the cutoff will not cross 90 (likely under 85), and basic sources plus common sense can still fetch 100 plus even in a very tough paper.

The two pillars behind every Sherlocking decision

Basic sources and common sense

Neil Sir reiterates that the surest way to maximise your shot at clearing Prelims is a thorough understanding of basic sources plus the disciplined application of common sense. Many of the questions in this set - on Sangam literature, nanoparticles, DNA barcoding and acid rain - were solvable even when the exact fact was unknown, simply by reasoning through the options.

An overview beats in-depth knowledge

The second pillar is that an overview of a topic is often more rewarding than deep, detailed knowledge. In his experience, the more you know on a subject, the more likely you are to get stuck in a 50-50 and paralysed by indecision. An overview keeps you decisive and more likely to land the right answer in the moment.

Elimination heuristics that solved questions 91-100

Spot extreme words versus soft statements

In the Sangam literature question (Q93), Neil Sir eliminated options the instant he saw absolutist phrasing - "devoid of any reference" and "no reference" are too extreme, so even a single counter-example makes them false. The soft, generic statement about the social classification of Varna being known to Sangam poets survived, and the answer was option (a). The same logic recurs wherever a statement leans on the soft directive "some".

Two similar options - the answer hides between them

When two options point at the same idea, the answer is usually one of the two. In the Ramanuja question (Q95), two options both spoke about salvation, so the answer had to be between them; the more contextual one - salvation through devotion, fitting the Bhakti movement - was correct. The B cells and T cells question (Q97) shows the same pattern: two options both said "protect the body from", and the immune-response option was right.

Back the most prominent name

For the Yoga Vasistha translation question (Q94), Neil Sir applied a simple rule: when a list of kings or kingdoms is given, lean towards the most prominent one. Akbar the Great stood out, he marked it, and it was correct - the same heuristic works when Ashoka the Great or similar towering figures appear among the choices.

Known trivia versus unknown trivia

In the Somnath Temple question (Q96), Neil Sir trusted statements he had genuinely read (it is a Jyotirlinga shrine; a description was given by Al-Biruni) and was suspicious of an unfamiliar piece of trivia. His rule: where you have context from a book you have actually read, use that context rather than common sense - but a rarely-seen piece of trivia is, in his analysis, incorrect around 80% of the time.

No "all of the above"? At least one statement is wrong

For multi-statement questions like nanoparticles (Q98) and DNA barcoding (Q99), the absence of an "all of the above" option told Neil Sir that at least one - and at most two - statements had to be incorrect. That single observation narrows the field before you even weigh the content. In the acid rain question (Q100), he points out UPSC was not even trying to confuse you: nitrogen oxide and sulphur dioxide (class 8 knowledge) were the causes, and only one option paired them.

Probabilistic bundling: playing the odds on pair-matching questions

Neil Sir finally explains the technique he had been promising. Across the 2022 paper there were eight "how many pairs are correctly matched" questions - Q13, Q56, Q62, Q70, Q87, Q88, Q91 and Q92. He solved them together using the normal distribution, or bell curve. Since the highest frequency sits around the mean, the likelihood that two or three pairs are correct (options B or C) is far higher than the likelihood of one or four (options A or D). He blindly marked B on all eight.

The result: four of the eight came out as B, giving him roughly +5.33 marks - and even marking C throughout would have given a similar score. He lays out the maths honestly so you can see the risk:

• 4 correct, 4 wrong gives about +5.33
• 3 correct, 5 wrong gives about +2.67
• 2 correct, 6 wrong gives 0, the same as leaving them blank
• 1 correct, 7 wrong gives about -2.67
• 0 correct, 8 wrong gives about -5.33

Because of this downside, Neil Sir is clear that probabilistic bundling is only for those with a high risk appetite - aspirants targeting the IFoS cutoff, or candidates whose attempt is effectively gone and who therefore have nothing to lose by maximising their shot.

Play the question, not just the content

Borrowing a line from the TV show Suits - "you don't play the odds, you play the man" - Neil Sir argues you should play the question and the options. How difficult a question is depends heavily on how the options are framed, not just on the content; the acid rain question was easy precisely because UPSC set only one viable option. Treating Prelims as a game of probability, he predicts the cutoff will not exceed 90 (likely under 85), and insists a well-prepared aspirant could score 100 plus even in what he calls arguably the most difficult Prelims paper of all time.

Who should watch this

This finale is for serious UPSC Prelims aspirants who want a repeatable, low-knowledge-dependent method to attack tricky MCQs and statement-based questions. It is especially useful for those revising previous-year papers, candidates worried about 50-50 dilemmas, and risk-tolerant aspirants (including IFoS hopefuls) weighing when probabilistic guessing is worth it.

The real value comes from doing, not watching. Take the 2022 paper, apply these heuristics question by question, and then test them on more previous-year papers to build trust in the method. To put the elimination drills into timed practice, work through our Prelims test series, and explore more guides on Prelims strategy.