General Knowledge & Current Affairs
- Bharat Ratna Winners (Recent) — Remember "MPNK" for 2019 batch: Madan Mohan Malaviya, Pranab Mukherjee, Nanaji Deshmukh, Bhupen Hazarika (posthumous trio). Latest: Karpoori Thakur (2024) - Bihar's "Jannayak".
- Champaran Satyagraha Memory — "1917 = 19+17 = 36" (Gandhi's first major success, Champaran indigo farmers' movement in Bihar). Remember: CHAMParan made Gandhi the CHAMP of masses.
- UN Day Anchor — UN founded 24 October 1945. Trick: "24/10 = 2.4" and UN has 2 main bodies (GA & SC), founded after WW-II (1945 = 19+45=64, divisible by 4 world powers).
- Currency Pairs Mnemonic — "PURDY": Pakistan-Rupee, USA-Dollar, Russia-Ruble, Denmark-Krone, Yen-Japan. For Europe: "ESPRIT" - Euro-Spain, Pound-UK, Ruble-Russia, Yen-Japan, Taka-Bangladesh.
History
- Ancient Dynasties Timeline — "Mr. MANGO": Maurya → Rajput → Mughal → Arab → Nanda → Gupta → Other. Or chronologically: "NHS MG" - Nanda, Haryanaka, Shishunaga, Maurya, Gupta.
- 1857 Centers Mnemonic — "Delhi Me Bareilly Ka Lucknow Jhanda": Delhi, Meerut, Bareilly, Kanpur, Lucknow, Jhansi (six major revolt centers). Meerut started (10 May), Delhi proclaimed Bahadur Shah king.
- Mughal Rulers Order — "BABUR Humayun Aaj Shaam Aur Bahadur": Babur, Humayun, Akbar, Jahangir, Shah Jahan, Aurangzeb, Bahadur Shah Zafar (last). Seven emperors in chronological sequence.
- Pre-history Ages — "PSM-BIC": Palaeolithic → Stone → Mesolithic → Bronze → Iron → Chalcolithic. Remember: Stone ages come first, then metals (Bronze before Iron).
- Bihar's Nalanda Memory — Founded by "KG" - Kumaragupta I (5th century Gupta). Destroyed 1193 by Bakhtiyar Khilji. "11-93" sounds like "eleven ninety-three" - easy anchor.
Geography
- River Origination — "GYB in Himalayas": Ganga (Gangotri), Yamuna (Yamunotri), Brahmaputra (Tibet/Mansarovar region). For peninsular: "NKTG flow East": Narmada-Tapi flow West (exception), Krishna-Godavari East.
- Monsoon Months — "JJAS": June, July, August, September (SW Monsoon over India). Withdrawal: "OS-ND" - October-September (retreats), November-December (NE monsoon in TN).
- Climate Zones Trick — "TEMPO zones": Tropical, Equatorial, Mediterranean, Polar, Oceanic. India has Tropical Monsoon. Mediterranean = hot dry summer, wet winter.
- Bihar Rivers Order — "GSKP-GF": Ganga, Son, Kosi, Punpun, Gandak, Falgu (major rivers). Kosi = "Sorrow of Bihar" (floods). Son joins Ganga from South (only major southern tributary).
- Soil Types MNEMONIC — "ALARM": Alluvial, Laterite, Arid, Red, Mountain/Mountainous. Alluvial = most fertile (40% India), found in Bihar's plains extensively.
Constitution of India
- FR List Memory — "EFFECTS": Equality, Freedom, Exploitation (against), Cultural/Education, Traffic (constitutional remedies), Speech (under freedom). Six fundamental rights (Property removed 1978).
- Emergency Types — "NEW": National (Article 352), Emergency in state (356), War/Financial emergency (360). 352 = national security, 356 = constitutional machinery failure, 360 = financial.
- DPSP Grouping — "SEI": Socialistic (welfare, living wage), Economic (property distribution), International peace. Non-justiciable but fundamental in governance (Article 36-51).
Economics
- Budget Date Anchor — 1 February since 2017 (earlier 28 Feb). Remember: "Feb-1st" for faster implementation before fiscal year (April 1). Railway Budget merged 2017.
- Bank Nationalization Years — "1969 = 14 banks" (Indira Gandhi), "1980 = 6 more banks". Trick: 69+11=80 (add 11 years for second wave). Total 20 nationalized.
- Inflation Types — "CDS": Creeping (slow, <3%), Demand-pull (excess demand), Stagflation (inflation + stagnation). Creeping good, galloping/hyperinflation bad (>10%).
Mathematics
- Divisibility Rule 7 — Double the last digit, subtract from remaining number. If result divisible by 7, original is too. Example: 203 → 20-(3×2)=14, divisible. Quick check for competitions.
- Compound Interest Shortcut — For 2 years: CI-SI difference = (SI²/100P). For 3 years: difference = SI(300+R)/100². Saves 15-20 seconds versus full CI calculation.
- Time-Distance Formula — Relative speed: Same direction = S₁-S₂; Opposite = S₁+S₂. Average speed ≠ (S₁+S₂)/2; use 2S₁S₂/(S₁+S₂) for same distance both ways.
- Percentage to Fraction — Memorize: 12.5%=⅛, 16.67%=⅙, 33.33%=⅓, 37.5%=⅜, 62.5%=⅝, 87.5%=⅞. Instant conversion speeds up profit-loss, SI-CI problems significantly.
- Geometry Angle Sum — Polygon interior angles = (n-2)×180°. Pentagon=540°, Hexagon=720°. Each exterior angle of regular polygon = 360°/n. Instant recall formula.
General Science
- pH Scale Memory — pH < 7 = Acidic (lemon, vinegar), pH = 7 = Neutral (water), pH > 7 = Basic (soap, baking soda). "7-up is neutral UP-line basic".
- Blood Groups Universal — "O negative = Universal Donor" (gives to all), "AB positive = Universal Recipient" (receives from all). Remember: O looks like zero (gives), AB like ALL (receives).
- Vitamin Deficiency — "ABCD-EK": A-Night blindness, B-Beriberi, C-Scurvy, D-Rickets, E-Sterility, K-Blood clotting issues. First letter match helps instant recall.
- Newton's Laws Quick — 1st = Inertia (rest/motion continues), 2nd = F=ma (force-mass-acceleration), 3rd = Action-Reaction equal opposite. "IFA" - Inertia, Force, Action-Reaction.
- Metal Reactivity Series — "Please Send Charlie's Monkeys And Zebras In Lead Cages Having Secure Guards": Potassium, Sodium, Calcium, Magnesium, Aluminium, Zinc, Iron, Lead, Copper, Mercury, Silver, Gold. Descending reactivity order.
Hindi Grammar
- Karak Types Mnemonic — "कसा को से में पर