Indian Freedom Struggle
1857 Revolt Centers: DMKLB — Delhi, Meerut, Kanpur, Lucknow, Bareilly (major centers of the First War of Independence). Remember as "Delhi Mein Kafi Log Baithe" for quick recall during questions about revolt epicenters.
GAIP for Moderates — Gokhale, Agarkar, W.C. Iyer, Pherozeshah Mehta were prominent Moderate leaders (1885-1905). Moderates believed in constitutional methods, petitions, prayers before Extremists emerged.
Quit India 8-8-42 — August 8, 1942: Bombay session where "Quit India" launched. Remember as "8-8-42" for date-based MCQs about this decisive mass movement.
Gandhi's 5 Cs — Champaran (1917), Ahmedabad (Cotton mill—1918), Kheda (1918), Non-Cooperation (1920), Civil Disobedience (1930). His major movements in chronological order.
Indian Geography
RAJUMA Plateaus — Rajasthan (Aravalli), Junagadh, Malwa, Chota Nagpur, Deccan, Telangana (major plateaus). Quick recall for peninsular plateau questions.
Right-bank Ganga tributaries: GYSK — Yamuna, Son, Gomti, Kosi flow from the right (south). Left-bank: Ghaghra, Gandak, Ramganga from north (Himalayas). Right=fewer rivers.
VIBGYOR = Western Ghats — Vembanad, Idukki, Bandipur, Goa, Yana, Ooty, Radhanagari—runs through these famous locations in Kerala-Karnataka-Goa-Maharashtra stretch, parallel to west coast.
Latitude 23.5°N = Tropic of Cancer — Passes through 8 states: Gujarat, Rajasthan, MP, Chhattisgarh, Jharkhand, West Bengal, Tripura, Mizoram (remember: GuRaMaChaJhaWeTripMiz).
Indian Polity and Constitution
LEMURS = Fundamental Rights — Liberty, Equality, Minorities, Untouchability abolished, Religion, Speech/Expression (Articles 14-32). Six categories for easy recall.
CIJE Cabinet = Parliamentary System — Collective responsibility, Individual ministerial responsibility, Joint responsibility, Executive=lower house majority. Core features borrowed from Britain.
42nd Amendment = Mini-Constitution — Added Socialist, Secular, Integrity to Preamble; added Fundamental Duties (Article 51A); shifted more power to Centre. Most comprehensive amendment (1976).
61st Article = Presidential Election — President elected by Electoral College (MPs + MLAs). Vice-President by MPs only (66th Article). Remember: 61=President needs both houses + states.
Indian Economy
FEMA 1999 replaced FERA 1973 — Foreign Exchange Management (civil offense) replaced Foreign Exchange Regulation (criminal). Liberalization milestone; FEMA=friendlier to business, remember "Management not Regulation."
MSP = C2 + 50% — Minimum Support Price formula: Cost of production (C2) plus minimum 50% margin. Swaminathan Commission recommended; partially implemented for MSP calculation.
Repo vs Reverse Repo — Repo=RBI lends to banks (increases money supply); Reverse Repo=banks lend to RBI (decreases money supply). Remember: Repo=Replenish money in economy.
General Science
Rainbow VIBGYOR — Violet, Indigo, Blue, Green, Yellow, Orange, Red (increasing wavelength, decreasing frequency). Essential for optics questions in general science.
Vitamin ADEK = Fat-soluble — Vitamins A, D, E, K are fat-soluble; rest (B-complex, C) are water-soluble. Fat-soluble stored in liver/fatty tissues; water-soluble need daily intake.
pH < 7 Acid, pH > 7 Base — pH 7=neutral (water). Lemon=2, Blood=7.4, Soap=10. Remember: "Seven is Heaven" (neutral); below is acidic, above is basic/alkaline.
West Bengal Geography
Darjeeling-Kalimpong-Kurseong = DHR — Darjeeling Himalayan Railway (DHR—toy train) connects these three hill stations. UNESCO World Heritage Site since 1999; remember DHR for tourism/geography questions.
Sundarbans 3 Rivers — Ganga, Brahmaputra, Meghna delta forms Sundarbans (largest mangrove forest). Royal Bengal Tiger habitat; remember "GBM delta" for deltaic formation questions.
North Bengal = Siliguri-Jalpaiguri-Cooch Behar — The northern districts corridor connecting Northeast. Siliguri="chicken's neck" of India, strategic location for geography MCQs.
History of West Bengal
1905 Partition = Curzon — Bengal partitioned by Lord Curzon (Oct 16, 1905); annulled 1911. Sparked Swadeshi movement. Remember: Curzon's Curse on Bengal—divided on communal lines.
Battle of Plassey 1757 — June 23, 1757: Siraj-ud-Daulah defeated by Robert Clive. Mir Jafar's betrayal. Foundation of British rule in India; remember "1757 = Plassey = Clive's Treachery."
Arithmetic - Number System
Divisibility by 3 or 9 — Sum of digits divisible by 3 (or 9) means number divisible by 3 (or 9). E.g., 1234: 1+2+3+4=10 (not divisible), so 1234 not divisible by 3/9.
Divisibility by 11 — Difference between sum of alternate digits divisible by 11. E.g., 1331: (1+3)-(3+1)=0 (divisible by 11). Quick check for large numbers.
Unit digit shortcuts — Cyclicity: 2⁴=16 (cycle 4), 3⁴=81 (cycle 4), 4²=16 (cycle 2), 9²=81 (cycle 2). For 2³⁷: 37÷4 remainder 1, so unit digit = 2¹ = 2.
Arithmetic - Time and Work
M₁D₁H₁/W₁ = M₂D₂H₂/W₂ — Men×Days×Hours/Work = constant. When men, days, or hours change, use this direct proportion formula to find missing values quickly.
LCM method for pipes — Tank capacity = LCM of filling times. Inlet efficiency = LCM/time, outlet = negative. Net filling rate = sum of efficiencies. Simplifies cistern problems instantly.
Arithmetic - Percentage
Percentage to Fraction — 10%=1/10, 12.5%=1/8, 16.66%=1/6, 20%=1/5, 25%=1/4, 33.33%=1/3, 50%=1/2. Memorize these for rapid calculation without calculator.
Successive Discount Formula — Two discounts a% and b%: Net = a + b − (ab/100). E.g., 20% then 10%: 20+10−(200/100) = 28% total discount, not 30%.
Arithmetic - Profit and Loss
CP from SP and Gain% — CP = [100/(100+Gain%)] × SP. For loss: CP = [100/(100−Loss%)] × SP. Direct formula avoids confusion in reverse calculations.
MP-Discount-SP chain — Marked Price − Discount = Selling Price. Profit calculated on Cost Price, discount on Marked Price. Never mix the two bases in calculations.
English Language - Idioms and Phrases
Break the ice — Initiate conversation in awkward situation. Common in comprehension