CSIR-CRRI JSA common mistakes
CSIR-CRRI JSA · Understand the traps and how to avoid them.
Spending 10+ minutes on a single seating-arrangement or puzzle set, then rushing the remaining reasoning questions with guesswork.
Candidates treat every puzzle as solvable if they just keep drawing, so sunk-cost thinking keeps them locked on one item; JSA reasoning sections mix easy series/coding items with two or three heavy puzzles, and the easy marks are abandoned.
What to do instead
Before starting, scan the whole reasoning section and tag each question as quick, medium, or puzzle. Attempt all quick and medium items first, then return to puzzles with the remaining time. If a puzzle has no definite arrangement after roughly 90 seconds of testing two case splits, mark it and move on.
Committing to the first arrangement that satisfies the clues without checking whether a second valid arrangement exists, then marking an answer that is only 'possibly true'.
Under time pressure, candidates stop at the first working case and misread 'must be true' questions as 'can be true'. JSA-style puzzles often include one or two clues that leave two cases open.
What to do instead
For every 'must be true / definitely correct' question, deliberately construct a second arrangement that also fits all clues. Only an option true in both cases is correct. If an option holds in one case but fails in the other, eliminate it. Practise this two-case check until it becomes automatic.
Losing marks on number series and coding-decoding by guessing the pattern from only the first two terms instead of verifying it across the whole sequence.
Common patterns (differences, squares, alternating operations, letter-position shifts) overlap for the first couple of terms, so an early guess often fits term 1 and 2 but breaks at term 4. Candidates then pick a wrong option confidently.
What to do instead
Write the differences or letter shifts for every consecutive pair before choosing. Test the hypothesised rule against the last given term and use it to compute the missing term. For coding-decoding, decode at least two full words and confirm the letter mapping is consistent (including reversal or position-sum variants).
Calculating percentages, ratios, and averages with the wrong base - for example applying a discount to the marked price after already adding profit, or taking the average of averages.
Word problems embed the base in the phrasing ('profit on cost', 'discount on marked price', 'average of the remaining group'), and candidates pattern-match to a familiar formula without identifying what the percentage is measured against.
What to do instead
Before computing, write one line: 'Base = ___'. Convert every percentage to a fraction of that stated base. For successive changes, use the multiplier method (e.g., 1.2 × 0.85) rather than adding and subtracting percentages. For averages, recompute total = average × count at each step.
Rushing the data-interpretation or arithmetic section and making arithmetic slips (decimal placement, unit mismatch, misreading a table row) that cost more marks than the time saved.
JSA quantitative sections are scored per correct answer with no penalty for wrong answers on many patterns, so candidates speed up to attempt everything and trade accuracy for coverage; also, tables and charts invite row/column misreads.
What to do instead
Allocate a fixed time per question (e.g., 60–75 seconds) and use approximation only when options are far apart. For tables, point at the row and column with a pencil before reading the number. Keep a rough-work column and re-add the final step once. Attempting 80% with high accuracy beats 100% with slips.
Skipping the unit and ratio checks in time-work, speed-distance, and mensuration questions, so the final numeric answer matches an option but is dimensionally wrong.
Options are often designed around the common slip (minutes vs hours, cm vs m, radius vs diameter), so a wrong-unit answer still appears in the list and feels confirmed.
What to do instead
Carry units through the calculation and write them next to the final number. In mensuration, explicitly note whether the given value is radius or diameter and whether the answer needs square or cubic units. In time-work, convert all rates to work-per-hour before combining.
Answering general-awareness questions from vague familiarity, choosing a plausible-sounding option (e.g., a neighbouring state, a similar-sounding scheme, a nearby year) instead of a known fact.
JSA awareness covers Indian polity, geography, science, and current affairs broadly; candidates recognise the topic but not the exact detail, and the options are built to reward recognition over recall.
What to do instead
Adopt a rule: if you cannot state the fact in one confident sentence, skip or mark for review rather than guess between close options. Build a compact fact sheet for high-yield areas - constitutional articles and amendments, states and capitals, national parks and rivers, major schemes and their launch years, basic physics/chemistry units - and revise it in short daily cycles rather than reading long articles.
Misreading the question stem in English usage items - answering what the sentence 'should' say rather than what is asked (error location, synonym in context, active/passive conversion).
Candidates read the sentence first and the instruction second, so the grammatical error they notice hijacks the answer even when the question asks for the correct replacement or the meaning of an idiom.
What to do instead
Read the instruction line first and underline the key demand (e.g., 'part containing the error', 'nearest in meaning', 'correctly spelt'). Then read the sentence. For error-spotting, check the standard sequence: subject-verb agreement, tense consistency, preposition, article, pronoun reference.
Choosing an English option because it sounds formal or 'impressive' rather than because it fits the sentence's grammar and register, especially in fill-in-the-blank and idiom questions.
Rare words feel more correct to candidates who studied vocabulary lists, but exam distractors are often deliberately ornate; idioms also have fixed forms that cannot be guessed from their literal words.
What to do instead
For fill-in-the-blank, insert each option into the sentence and check collocation and preposition agreement, not just meaning. For idioms and phrases, learn them as fixed units with one example sentence each, and reject any option whose literal reading is being substituted for the idiomatic meaning.
Managing the paper as one continuous block - no sectional time budget, no review pass - so the last section is attempted in the final minutes or left blank.
Sections differ sharply in time-per-mark (reasoning puzzles are slow; awareness is fast), and candidates who start at question 1 and plod through never reach the cheap marks at the end.
What to do instead
Set a written sectional budget before the exam (e.g., awareness first for its speed, then English, then quantitative, then reasoning) and stick to it with a watch. Reserve the last 5–7 minutes for a review pass over marked questions only, filling every blank since there is usually no negative marking, and never re-solving questions already answered confidently.