Reasoning, Aptitude & English for Competitive Exams: quick revision, 20 bites

Three Pillars of Competitive Exams

Every exam paper stands on these 3 pillars.

Competitive exams test three distinct skill sets, each requiring a different preparation strategy.

Takeaway. Reasoning tests logic, Aptitude tests speed with formulas, English tests language precision — prepare each differently.

Syllogism: Drawing Valid Conclusions

All A are B. All B are C. So?

Use **Venn diagrams** to visualize relationships and check if a conclusion is definitely true, possibly true, or false.

Takeaway. A conclusion is valid only if it holds true in every possible Venn diagram of the premises.

Syllogism: The 'Some' Trap

Don't assume 'some' means 'some not'.

Takeaway. 'Some' in syllogism means 'at least one' — never assume it implies 'some are not'.

Blood Relations: Decode the Family Tree

Draw the tree, not the drama.

Takeaway. Always draw a family tree diagram — verbal reasoning alone causes errors in blood relation questions.

Percentage: The Master Formula

One formula unlocks a dozen topics.

Takeaway. Percentage change is the backbone of profit-loss, interest, and data interpretation problems.

Time, Speed & Distance: Core Trio

Speed, time, distance — one triangle rules all.

Convert km/h to m/s by multiplying with $\frac{5}{18}$.

Takeaway. Memorize the speed-distance-time triangle and the train/boat variations — they cover most exam questions.

Simple vs Compound Interest

SI is flat. CI is explosive.

Takeaway. CI grows faster than SI because interest is calculated on the updated amount each period.

Data Interpretation: Read Before You Solve

DI is 80% reading, 20% math.

Takeaway. In DI, spend 30 seconds understanding the chart before touching the calculator.

Coding-Decoding: Find the Pattern

Every code hides a simple rule.

Takeaway. Check letter positions, shifts, and reversals first — most coding patterns use these three.

Seating Arrangement: Fix the Anchor

One fixed seat solves the whole puzzle.

For circular arrangements, fix one person's position and direction, then arrange others clockwise or anticlockwise.

Takeaway. Always start seating puzzles from the most definite clue — never guess from ambiguous ones.

Inequality: The 'Either-Or' Confusion

Not every pair gives a conclusion.

Takeaway. In inequality, a conclusion is valid only if a continuous chain connects the two elements.

Statement & Assumption: Read Between Lines

What is taken for granted here?

Takeaway. An assumption is what the speaker takes for granted — it must be true for the statement to make sense.

Cause & Effect: Which Came First?

Cause before effect — always.

Takeaway. In cause-effect questions, verify the direction — the cause must precede and produce the effect.

Reading Comprehension: Skim, Scan, Solve

Don't read every word — read smart.

Takeaway. In RC, the passage is the only source of truth — never use personal knowledge to answer.

Spotting Errors: Subject-Verb Agreement

The verb must match its subject.

Takeaway. Find the real subject, ignore the phrase between subject and verb, then match the verb.

Remember SI vs CI Formulas

SI = PRT. CI = P(1+R)^T.

**SI** = **P**rincipal × **R**ate × **T**ime ÷ 100. Think: '**P**lease **R**emember **T**he formula.'

Takeaway. SI is flat multiplication; CI is exponential growth — the formula shape tells you which is which.

Exam Strategy: Attempt in This Order

Easy first, hard last — always.

Takeaway. Attempt easy questions first to lock in marks — never let one hard question eat your time.

Where You'll Use These Skills

These skills go beyond the exam hall.

Takeaway. Reasoning, aptitude, and English are life skills — exams just measure them.

Don't Over-Calculate in Aptitude

Approximation saves more time than accuracy.

Takeaway. In aptitude, approximation + option elimination beats exact calculation for speed.

Current Affairs: Static vs Dynamic

Not all current affairs are equal.

Takeaway. Static GK is memorized once; dynamic GK needs daily updates — prepare both differently.