General Studies
Divisibility by 11 — Alternating sum: add digits in odd positions, subtract digits in even positions. If result is 0 or divisible by 11, the number is divisible by 11. Example: 121 → (1+1)−2 = 0 ✓
VIBGYOR for Light Spectrum — Violet, Indigo, Blue, Green, Yellow, Orange, Red. Remember the order of visible light wavelengths from shortest (380nm) to longest (700nm) for optics questions.
Monsoon Onset Sequence — "Ken Brings Monsoon Directly": Kerala (June 1), Bay of Bengal, Mumbai, Delhi. Southwest monsoon arrival sequence helps with climate questions and agricultural patterns.
Indian Struggle Timeline: 1857-1947 — Decade anchors: 1857 (Revolt), 1885 (Congress), 1905 (Partition Bengal), 1919 (Jallianwala), 1930 (Salt March), 1942 (Quit India), 1947 (Independence). Space events by ~15 years.
Ancient Dynasty Order: MGSCK — Maurya, Gupta, Slave, Chalukya, Khilji. North Indian power sequence helps establish chronological context for art, architecture, and administrative questions.
Latitude Parallels: 30-60-90 — Tropic Cancer 23.5°N, Arctic Circle 66.5°N differ by ~43°; Equator-Tropic-Polar = 0-23.5-66.5-90. Mental map for climate zones and day-length variations.
GDP Components: GICE — Government spending, Investment, Consumption, Exports minus imports. National income accounting formula: Y = C + I + G + (X−M).
Nagaland — History, Society, Culture and Heritage
Article 371A Memory: RROC — Religious/social practices, Right to land resources, Ownership of land, Customary law. Four core protections granted to Nagaland under special constitutional provision.
16 Points in Three Groups — Political (state creation, tribal affairs), Cultural (customary law protection, religious freedom), Administrative (regional councils, Governor's role). Signed August 1960 between Naga Peoples Convention and Government of India.
Major Districts: KMPDW — Kohima, Mokokchung, Phek, Dimapur, Wokha. Five of eleven districts; remember Kohima (capital), Dimapur (commercial hub), Mokokchung (cultural center) for administrative geography questions.
Naga Tribes Count: "Sixteen Recognized" — Major tribes include Angami, Ao, Sema (Sumi), Konyak, Lotha. Christianity arrived 1872 via American Baptists; now 90%+ Christian population since missionaries post-1870s.
Hornbill Festival: December 1-10 — "Festival of Festivals" held annually at Kisama Heritage Village. Showcases all tribes simultaneously; named after bird revered in Naga folklore. Key tourism and cultural identity event.
Bamboo Economy: "Green Gold" — Nagaland has 53+ bamboo species. Used in construction, handicrafts, food (bamboo shoot curry), and paper. State Bamboo Mission promotes cultivation and processing industries.
General Mental Ability Test
BODMAS Trap Avoidance — Brackets, Of/Orders, Division/Multiplication (left-to-right), Addition/Subtraction (left-to-right). Common error: doing all multiplication before division. Process same-priority operations left-to-right strictly.
Data Interpretation: Percentage Base Check — "Percentage of what?" Always identify base. 50% increase then 50% decrease ≠ original (it's 25% less). Percentage change formula: [(New−Old)/Old]×100.
Syllogism: Venn Diagrams Always — Convert "All A are B" to circles. Test conclusion by checking if diagrams support it in ALL possible arrangements, not just one. Reject if any valid diagram contradicts.
Number Series: Difference of Differences — If first difference unclear, find second difference. Example: 2,5,10,17,26 → differences 3,5,7,9 → second difference constant (+2). Spot +2, +3 patterns this way.
Seating Arrangement: Clockwise Fix — Always mark positions 1-N clockwise from a fixed person. "A sits left of B" depends on viewpoint; avoid confusion by consistent clockwise numbering and direction notation.
Ratio Shortcut: Common Multiplier — A:B = 2:3 and B:C = 4:5 → make B equal. Multiply first by 4, second by 3 → A:B:C = 8:12:15. Align common terms instantly for three-way ratios.