General Studies
3-6-9 Divisibility Trio — A number is divisible by 3 if digit-sum divisible by 3; by 9 if digit-sum divisible by 9; by 6 if even AND divisible by 3. Quick mental check: 8,427 → 8+4+2+7=21 → divisible by 3 only.
HYV Rice Memory: IR-8 — Remember India's Green Revolution wonder rice as "IR-8" (International Rice-8, 1966). Mnemonic: "I Rate it 8/10" for transforming Punjab-Haryana wheat-rice belt post-1966.
Poverty Line Basket: CFEMS — Indian poverty estimation uses Calories, Food, Education, Medical, Shelter. Tendulkar (2011) added private expenditure on health/education beyond just calories.
Climate Change COPs: P-K-P — Kyoto Protocol (1997), Paris Agreement (2015). Mnemonic: "Kyoto Promised, Paris Acted" — Kyoto set targets, Paris made all nations commit (NDCs).
Biodiversity Hotspots Count: 4-in-36 — India has 4 of world's 36 hotspots: Western Ghats, Eastern Himalayas, Indo-Burma, Sundaland. "WEIS" covers India's mega-diversity zones.
monsoon Onset Memory: K-M-D — Southwest monsoon hits Kerala (June 1), Mumbai (June 10), Delhi (June 29). Remember: "K first, M mid-month, D month-end" for progression pattern.
Chandigarh — Planning, Heritage and Administration
Le Corbusier's 3 Buildings: SAS — Capitol Complex UNESCO trio: Secretariat, Assembly, High Court (think "S-A-Supreme judiciary"). Open Hand Monument is the symbol but not UNESCO-listed building.
Rajiv-Longowal Date Anchor: '85 = 5+5=10 — 1985 accord (July 24). Remember "Punjab Accord 8+5=13 → Section 13 transferred Chandigarh" (though never implemented). Links Punjab militancy resolution attempt.
Chandigarh UT Status: No 3 L's — No Legislature, No Land revenue, No Local autonomy like states. Administered by Administrator (IAS) appointed by President; shares HC with Punjab-Haryana.
Rock Garden Material: U-W-B — Nek Chand used Urban waste, Waste ceramics, Broken bangles/tiles. "Unwanted Waste Became art" — 40-acre fantasy garden from recycled industrial/home waste.
Sukhna Lake Origin: 1958=Plan+2 — Created 1958 (City inaugurated 1956+2 years). Artificial rainfed lake at Shivalik foothills; silting is chronic issue. "Sukhna = Shivalik Under-Hill Nature Asset."
General Mental Ability and Aptitude
BODMAS Trap Alert: Left-to-Right MD — After Brackets/Orders, do Multiplication/Division left-to-right (not M before D), then Addition/Subtraction left-to-right. 20÷5×2 = (20÷5)×2 = 8, NOT 20÷10=2.
Percentage-Fraction Speed Conversions — 12.5%=⅛, 16.66%=⅙, 20%=⅕, 25%=¼, 33.33%=⅓, 50%=½. Memorize these six; calculations become 4× faster in Data Interpretation.
Logical Sequence: ALPS — Blood Relations use Age clues, Language patterns (maternal/paternal), Pedigree tree drawing, Sex identification. Always draw family tree for complex 3+ generation problems.
Data Interpretation: Headline First — Read chart title/axes labels BEFORE questions. 60% of mistakes come from confusing "percentage" vs "absolute numbers" or misreading Y-axis scale (thousands/lakhs).
Syllogism Venn Diagrams: 3-Circle Max — For "All A are B; Some B are C" type, draw overlapping circles. Only 4 valid conclusions possible: All/Some/No/Some-not. Beware "All+Some≠All" trap.
Analogy Pattern: R-F-N — Check Relation type (synonym/antonym/part-whole), Function (tool-use), Number pattern (letters/position). 80% analogies fall in these three categories; identify which first.