📗 NCERT Key Summaries (Class 6–12) — High-Yield Points

Condensed exam-relevant takeaways per subject. Use as a rapid-revision layer over full NCERT reading, not a substitute for the first reading.

1. HISTORY

Ancient India

Prehistory: Paleolithic (hunting-gathering, Bhimbetka caves) → Mesolithic (microliths) → Neolithic (agriculture begins, Mehrgarh ~7000 BCE) → Chalcolithic (copper + stone).
Indus Valley Civilization (2600–1900 BCE): Town planning (grid pattern, drainage), Great Bath (Mohenjo-daro), dockyard (Lothal), no clear temples/weapons of war, undeciphered script, trade with Mesopotamia (Meluhha). Decline: climate change/river shifts — not proven invasion.
Vedic Age: Early Vedic (Rig Veda, pastoral, Sabha & Samiti, no rigid caste) → Later Vedic (agriculture, varna rigidifies, territorial kingdoms). Vedas: Rig, Sama (music), Yajur (rituals), Atharva (spells). Vedangas, Upanishads (philosophy — "Satyameva Jayate" from Mundaka Upanishad).
6th century BCE: 16 Mahajanapadas (Magadha strongest — iron, elephants, fertile land). Rise of Buddhism (Buddha: Lumbini birth, Bodh Gaya enlightenment, Sarnath first sermon, Kushinagar death; Four Noble Truths, Eightfold Path; councils; Hinayana/Mahayana split at 4th council) and Jainism (Mahavira 24th Tirthankara; triratna; ahimsa extreme; Svetambara/Digambara).
Mauryas (321–185 BCE): Chandragupta (Megasthenes' Indica, Kautilya's Arthashastra), Ashoka (Kalinga war → Dhamma; Major/Minor Rock Edicts — Edict XIII on Kalinga; Brahmi script deciphered by James Prinsep 1837). Administration: centralised, provinces, spies (gudhapurushas).
Post-Mauryan: Sungas, Satavahanas (Deccan), Indo-Greeks (first gold coins, Menander/Milinda), Kushanas (Kanishka — 4th Buddhist council, Gandhara & Mathura art schools, Silk Road).
Guptas (320–550 CE): "Golden Age" — Samudragupta (Prayaga Prashasti by Harishena), Chandragupta II (Fa-Hien's visit, Navaratnas incl. Kalidasa), Aryabhata (zero, heliocentrism hints), Nalanda University, decimal system. Decline of women's status; land grants → feudalism seeds.
Sangam Age: Cheras, Cholas, Pandyas; Sangam literature (Tolkappiyam); Roman trade (Muziris port).
South: Pallavas (Mahabalipuram rathas), Chalukyas (Badami), Rashtrakutas (Ellora Kailasa temple), Imperial Cholas (Rajaraja I — Brihadeshwara temple; Rajendra I — Gangaikonda Cholapuram, naval expedition to Srivijaya; village self-government — Uttaramerur inscriptions).

Medieval India

Delhi Sultanate (1206–1526): Slave (Iltutmish — Iqta system, Razia Sultana), Khilji (Alauddin — market control, Deccan raids), Tughlaq (Muhammad-bin — token currency & capital shift failures; Firoz — canals), Sayyid, Lodi. Ibn Battuta visited under M-b-Tughlaq.
Vijayanagara (1336, Harihara & Bukka) vs Bahmani: Krishnadevaraya (Amuktamalyada, Hampi; visited by Paes/Nuniz). Battle of Talikota 1565.
Mughals: Babur (Panipat 1526, tuzuk), Humayun, Akbar (Din-i-Ilahi, sulh-i-kul, mansabdari, abolished jizya, Ibadat Khana, Navaratnas), Jahangir (chain of justice, painting zenith), Shah Jahan (Taj Mahal, architecture zenith), Aurangzeb (reimposed jizya, Deccan quagmire). Land revenue: zabti/dahsala (Todar Mal).
Marathas: Shivaji (Ashtapradhan, guerrilla warfare, coronation 1674, chauth & sardeshmukhi), Peshwas, Third Panipat 1761.
Bhakti-Sufi: Bhakti — Ramanuja, Kabir, Nanak, Chaitanya, Mirabai, Tulsidas; Alvars & Nayanars (South). Sufi — Chishti (Moinuddin Chishti, Nizamuddin Auliya), Suhrawardi silsilas.

Modern India

European advent: Portuguese (1498 Vasco da Gama, Calicut) → Dutch → English (EIC 1600) → French. Carnatic Wars → British supremacy.
British expansion: Plassey 1757 (Mir Jafar's betrayal), Buxar 1764 (decisive → Diwani of Bengal 1765), subsidiary alliance (Wellesley), Doctrine of Lapse (Dalhousie).
Economic impact: Drain of wealth (Dadabhai Naoroji — "Poverty and Un-British Rule"), deindustrialization, land settlements: Permanent (Bengal, zamindari, Cornwallis 1793), Ryotwari (Madras/Bombay, Munro), Mahalwari (North-West).
1857 Revolt: Immediate cause greased cartridges; leaders — Rani Lakshmibai (Jhansi), Nana Saheb (Kanpur), Tantia Tope, Kunwar Singh (Bihar), Begum Hazrat Mahal (Lucknow), Bahadur Shah Zafar (figurehead). Result: Crown rule (GoI Act 1858), Queen's Proclamation.
Socio-religious reform: Raja Rammohan Roy (Brahmo Samaj 1828, sati abolition 1829 with Bentinck), Dayananda Saraswati (Arya Samaj 1875, "Back to Vedas"), Vivekananda (Ramakrishna Mission 1897, Chicago 1893), Jyotiba Phule (Satyashodhak Samaj), Sir Syed Ahmed Khan (Aligarh movement), Ishwar Chandra Vidyasagar (widow remarriage 1856).
INC (1885, A.O. Hume; first president W.C. Bonnerjee): Moderates (1885–1905: prayers/petitions; Naoroji, Gokhale) → Extremists (Lal-Bal-Pal, Swadeshi after Bengal Partition 1905) → Surat Split 1907 → Lucknow Pact 1916 (INC-Muslim League + moderate-extremist reunion) → Home Rule Leagues (Tilak, Besant).
Gandhi era: Champaran 1917 (indigo, first satyagraha in India), Kheda & Ahmedabad 1918, Rowlatt Satyagraha & Jallianwala Bagh 1919, Khilafat & Non-Cooperation 1920–22 (Chauri Chaura withdrawal), Swaraj Party (C.R. Das, Motilal Nehru), Simon Commission 1928 ("Simon Go Back"), Nehru Report 1928 vs Jinnah's 14 Points, Purna Swaraj (Lahore 1929, 26 Jan 1930), Dandi March & Civil Disobedience 1930, Gandhi-Irwin Pact 1931, Round Table Conferences, Communal Award & Poona Pact 1932 (Ambedkar-Gandhi), GoI Act 1935 (provincial autonomy), Quit India 1942 ("Do or Die"), INA (Bose, Azad Hind), Cabinet Mission 1946, Mountbatten Plan & Independence Act 1947.
Revolutionaries: Bhagat Singh (HSRA, Assembly bomb 1929, executed 23 Mar 1931), Chandrashekhar Azad, Surya Sen (Chittagong armoury raid), Ghadar Party (US), Anushilan Samiti.

2. GEOGRAPHY

Earth: Interior (crust-mantle-core; discontinuities: Conrad, Moho, Gutenberg, Lehmann). Plate tectonics — convergent (Himalayas, trenches), divergent (mid-ocean ridges), transform (San Andreas). Earthquake waves: P (through all media), S (not through liquids — hence liquid outer core).
Landforms: Fluvial (V-valleys, meanders, deltas), glacial (cirques, moraines, U-valleys), aeolian (barchans, mushroom rocks), karst (stalactites), coastal (spits, tombolos).
Climatology: Insolation & heat budget; pressure belts (ITCZ, subtropical highs); planetary winds; Coriolis (right in NH); jet streams (subtropical westerly & easterly — monsoon link); El Niño (warm eastern Pacific → weak Indian monsoon), La Niña (opposite), IOD (positive → good monsoon); cyclones — tropical (warm ocean >26.5°C, low shear) vs temperate (frontal).
Indian monsoon: Differential heating + ITCZ shift + Tibetan plateau + jet streams; SW monsoon (Jun–Sep, ~75% rain; Arabian Sea & Bay of Bengal branches), retreating NE monsoon (Oct–Dec, Tamil Nadu rains).
India physiography: Himalayas (Trans, Greater/Himadri, Lesser/Himachal, Shiwaliks; duns), Northern plains (bhabar, terai, bangar, khadar), Peninsular plateau (oldest block), Western & Eastern Ghats, coasts, islands (Andaman — volcanic Barren Island; Lakshadweep — coral).
Rivers: Himalayan (perennial: Indus system — Jhelum/Chenab/Ravi/Beas/Sutlej; Ganga — Yamuna/Ghaghara/Gandak/Kosi/Son; Brahmaputra — Tsangpo in Tibet) vs Peninsular (seasonal: east-flowing Mahanadi/Godavari/Krishna/Cauvery form deltas; west-flowing Narmada/Tapi form estuaries, rift valleys).
Soils: Alluvial (most widespread, fertile), black/regur (cotton, moisture-retentive, Deccan trap), red (iron-rich, peninsular), laterite (leached, high rainfall areas, tea/coffee), arid, mountain.
Vegetation: Tropical evergreen (>200 cm rain), deciduous (70–200, largest area), thorn (<70), montane, mangroves (Sundarbans — largest).
Agriculture: Rabi (winter sown: wheat, mustard), Kharif (monsoon: rice, cotton), Zaid. Green Revolution (wheat, Punjab-Haryana-West UP).

3. POLITY

Constitution making: Constituent Assembly (Cabinet Mission 1946; first meet 9 Dec 1946; Objectives Resolution by Nehru 13 Dec 1946; adopted 26 Nov 1949; enforced 26 Jan 1950). Drafting Committee chair: B.R. Ambedkar.
Borrowed features: UK (parliamentary system, rule of law), US (FRs, judicial review, impeachment), Ireland (DPSP), Canada (federation with strong centre, residuary powers), Australia (concurrent list), Germany (emergency), USSR (fundamental duties), France (republic ideals), South Africa (amendment procedure), Japan (procedure established by law).
Preamble: Sovereign, Socialist, Secular (42nd Amdt 1976 added Socialist, Secular, Integrity), Democratic Republic; Justice, Liberty, Equality, Fraternity. Part of Constitution (Kesavananda 1973), amendable but not basic structure.
Fundamental Rights (Part III, Art 12–35): Equality (14–18), Freedom (19–22), Against exploitation (23–24), Religion (25–28), Cultural-educational (29–30), Constitutional remedies (32 — Ambedkar's "heart and soul"). Art 21 expanded (Maneka Gandhi 1978 — due process in effect). Right to property now legal right (Art 300A, 44th Amdt).
Writs: Habeas corpus, Mandamus, Prohibition, Certiorari, Quo warranto. SC (Art 32) & HC (Art 226 — wider scope).
DPSP (Part IV): Non-justiciable; socialist/Gandhian/liberal; Art 39A legal aid, 40 panchayats, 44 UCC, 48A environment, 50 separation of judiciary.
President: Indirect election (elected MPs+MLAs, single transferable vote); ordinances (Art 123), pardon (Art 72 — includes court martial & death), emergency powers. Veto: absolute, suspensive, pocket.
Parliament: LS 543, RS 245 (233 elected + 12 nominated). Money bill (Art 110 — Speaker certifies, RS 14 days only); joint sitting (Art 108 — not for money/constitutional amendment bills). Committees: Estimates (30 LS), PAC (22, opposition chair by convention), DRSCs.
Judiciary: Collegium (Second & Third Judges cases), basic structure (Kesavananda Bharati 1973), judicial review (Art 13). Key cases: Golaknath, Minerva Mills (balance FR-DPSP), S.R. Bommai (federalism, Art 356 review), Indra Sawhney (50% ceiling, creamy layer), Puttaswamy (privacy 2017), Shreya Singhal (66A struck down).
Federalism: Union/State/Concurrent lists; Art 249, 356 (President's rule), 360 (financial emergency — never used); GST Council (Art 279A, 101st Amdt).
Local govt: 73rd/74th Amdts 1992 — 3-tier PRI, 11th/12th Schedules, SEC, SFC, 1/3 women reservation, Gram Sabha.
Amendments: Art 368 — simple majority / special majority / special + half states ratification. 42nd ("mini-Constitution"), 44th (undid excesses), 52nd (anti-defection, 10th Schedule), 61st (voting age 18), 86th (RTE Art 21A), 103rd (EWS 10%).

4. ECONOMY

National income: GDP (domestic territory) vs GNP (nationals); market price vs factor cost; nominal vs real; base year 2011–12; GVA + product taxes − subsidies = GDP.
Money & banking: Functions of RBI (issuer, banker to govt/banks, monetary policy, forex — FEMA); MPC (6 members, repo decisions, CPI target 4% ± 2%); instruments: repo, reverse repo/SDF, MSF, CRR, SLR, OMO; money multiplier; NBFC vs bank.
Inflation: CPI (retail, MPC target — CSO/NSO) vs WPI (wholesale, no services); demand-pull vs cost-push; core inflation excludes food & fuel; deflation, stagflation, disinflation.
Fiscal: Budget (Art 112 — Annual Financial Statement); revenue vs capital receipts/expenditure; deficits — fiscal (total borrowings), revenue, primary (fiscal − interest); FRBM Act 2003; Finance Commission (Art 280 — vertical & horizontal devolution).
Taxation: Direct (income, corporate) vs indirect (GST — 101st Amdt, one nation one tax; slabs; council); progressive vs regressive; Laffer curve; tax buoyancy.
External: BoP = current account (trade + invisibles) + capital account; FDI (control, long-term) vs FPI (portfolio, hot money); rupee convertibility (full current, partial capital); REER/NEER; forex reserves components.
Growth history: 1951 Planning Commission (now NITI Aayog 2015), 1969 bank nationalization, 1991 LPG reforms (crisis: BoP; devaluation, delicensing, trade liberalization), 2016 demonetization + IBC + GST 2017.
Sectors: Agriculture ~18% GVA, ~45% employment (disguised unemployment); MSP by CACP for 23 crops; PDS/NFSA 2013 (67% coverage); industry — PLI schemes, Make in India; services — largest GVA share.

5. SCIENCE (Class 6–10 core + applications)

Physics: Motion & laws (inertia, F=ma, action-reaction), work-energy-power, sound (mechanical wave, needs medium; echo, SONAR), light (reflection/refraction — mirage, twinkling; dispersion — rainbow; scattering — blue sky, red sunset), electricity (Ohm's law, series/parallel, fuse/earthing), magnetism (electromagnetic induction — generators), heat (conduction/convection/radiation, sea breeze).
Chemistry: Atomic structure, periodic table trends, acids-bases-salts (pH scale — soil pH, antacids), metals/non-metals (reactivity series, corrosion, alloys), carbon compounds (covalent bonding, soaps — micelles).
Biology: Cell organelles (mitochondria — powerhouse; ribosomes — protein synthesis), photosynthesis & respiration, human systems (digestive, circulatory — double circulation; excretory — nephron; nervous — reflex arc; endocrine — insulin/thyroxine), reproduction (asexual/sexual, contraception), genetics (Mendel's laws, DNA, sex determination XY), evolution (natural selection, speciation), diseases (communicable: vector-borne — malaria/dengue; bacterial — TB/cholera; viral — flu/COVID/hepatitis; vaccines — active immunity), microbes in food & industry, biotechnology basics (GM crops — Bt cotton).
Environment-linked: Ozone (CFCs, Montreal Protocol), greenhouse effect, food chains & biomagnification (DDT), waste management.

6. SOCIOLOGY / SOCIETY (Class 11–12 themes)

Demographic transition stages; India's demographic dividend window; sex ratio trends; NFHS key indicators.
Caste: varna vs jati; sanskritization (M.N. Srinivas); reservation logic & debates.
Family: joint → nuclear shift; changing status of women; patriarchy concepts.
Urbanization: push-pull factors, slums, informal sector dominance.
Secularism: Indian model (principled distance) vs Western (strict separation).

Usage

Revise this file weekly in Phase 1, twice weekly in Phase 2. Convert unfamiliar lines back into full NCERT chapter reads.