Academic Session 2026-27

Tamil Nadu Board Class 8 Chapter Weightage 2026-27

Complete Mark Distribution for TNBSE Class 8 All Subjects

5 Core Subjects • Chapter-wise Marks • 80 Theory + 20 Internal • Plan Your Preparation Effectively

View Subject Weightage Free Consultation

5 Subjects 80 Theory Marks 20 Internal Marks 35% Passing Criteria

Chapter Weightage Overview 2026-27

Total Subjects

5 Core Subjects

Tamil, English, Mathematics, Science, Social Science

Total Marks

100 Marks per Subject

80 Theory + 20 Internal Assessment

Passing Criteria

35% in Each Subject

Must pass all subjects

Chapter-Wise Weightage 2026-27

Detailed mark distribution for each subject to help you prioritize your preparation.

Tamil (தமிழ்) - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
இலக்கியம் (Literature)	கற்பனை இலக்கியம் - கவிதை மற்றும் உரைநடை உரைநடை இலக்கியம் - சிறுகதை, கட்டுரை இலக்கிய வரலாறு - பண்டைய, இடைக்கால, நவீன இலக்கியப் படைப்பாளர்கள் இலக்கிய வகைகள் தமிழ் இலக்கியத்தின் சிறப்பம்சங்கள்	25	31.25%
இலக்கணம் (Grammar)	சந்தி - உயிர்ச்சந்தி, மெய்ச்சந்தி, புள்ளிச்சந்தி சமாசம் - தத்புருச, பஹுவிரிஹி, த்வந்துவ வேற்றுமை - முதலாம், இரண்டாம், மூன்றாம், நான்காம் அணிகள் - உவமை, உருவகம், தொடை, இயைபு சொல்வகை - பெயர்ச்சொல், வினைச்சொல், உரிச்சொல் தொடரியல் - வாக்கிய அமைப்பு	30	37.5%
உரைநடை (Composition)	கட்டுரை எழுதுதல் கடிதம் எழுதுதல் சுருக்கம் எழுதுதல் கதை எழுதுதல் உரையாடல் எழுதுதல் விளம்பரம் எழுதுதல்	20	25%
உள்கருத்து (Workbook)	பயிற்சி கேள்விகள் செயல்பாடுகள் மற்றும் திட்டங்கள் வீட்டுப்பாடம் மற்றும் தொடர் மதிப்பீடு	5	6.25%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)

English - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
Reading Comprehension	Unseen passages with comprehension questions Inference and analytical questions Advanced vocabulary building Word meanings and contextual usage Passage-based question answering Summary writing from passages	15	18.75%
Prose	Selected prose pieces from prescribed textbook Author introduction and literary contribution Critical analysis and interpretation Thematic and stylistic analysis Character analysis and plot study Moral and ethical lessons	20	25%
Poetry	Selected poems from prescribed textbook Poet introduction and literary contribution Poetic devices and analysis Meaning and interpretation Rhyme scheme and meter study Imagery and figurative language	15	18.75%
Grammar	Tenses - Present, Past, Future (All forms) Parts of Speech - Noun, Pronoun, Verb, Adjective, Adverb Prepositions and Conjunctions Active and Passive Voice Direct and Indirect Speech Articles and Determiners Modals and their usage Subject-Verb Agreement Sentence Transformation Error Correction	20	25%
Writing Skills	Essay Writing - Descriptive, Narrative, Argumentative Letter Writing - Formal, Informal, Business Story Writing with given clues Precis Writing and Summary Paragraph Writing Dialogue Writing Report Writing	10	12.5%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)

Mathematics - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
Number Systems	Rational Numbers - Properties and Operations Exponents and Powers - Laws and Applications Squares and Square Roots Cubes and Cube Roots Number Line Representation Real Numbers and their Properties Surds and their Operations	12	15%
Algebra	Linear Equations in One Variable Algebraic Expressions and Identities Factorization of Algebraic Expressions Introduction to Graphs Polynomials and Operations Standard Algebraic Identities Application of Algebraic Expressions	18	22.5%
Geometry	Understanding Quadrilaterals - Properties and Types Practical Geometry - Constructions Visualizing Solid Shapes Angles and Lines Triangles and their Properties Circle and its Parts Symmetry in Geometry	18	22.5%
Mensuration	Area of Plane Figures - Triangle, Quadrilateral, Circle Surface Area and Volume of Cubes, Cuboids, Cylinders Perimeter and Area of Regular Shapes Heron's Formula Conversion of Units Applications of Mensuration	15	18.75%
Data Handling	Data Handling and Representation Probability - Basic Concepts Frequency Distribution Mean, Median, Mode Graphical Representation - Bar Graph, Histogram Pie Chart and Line Graph Data Interpretation	10	12.5%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)

Science - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
Biology	Cell Structure and Functions Microorganisms: Friend and Foe Crop Production and Management Conservation of Plants and Animals Reproduction in Animals Cell Division - Mitosis and Meiosis Tissues - Plant and Animal Tissues Diversity in Living Organisms	22	27.5%
Chemistry	Coal and Petroleum - Formation and Uses Combustion and Flame - Types and Safety Chemical Effects of Electric Current Materials: Metals and Non-Metals Atomic Structure - Basic Concepts Chemical Reactions and Equations Acids, Bases and Salts Physical and Chemical Changes	20	25%
Physics	Force and Pressure - Types and Effects Sound - Production and Propagation Light - Reflection and Refraction Friction - Types and Applications Motion and Laws of Motion Energy and Work - Concepts Electricity - Basic Circuits Magnetism - Properties and Uses	20	25%
Environmental Science	Air and Water Pollution - Causes and Effects Environmental Conservation Climate Change and Global Warming Sustainable Development Natural Resources and their Conservation Waste Management Ecosystem and Biodiversity	18	22.5%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)

Social Science - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
History	Ancient Indian History - Indus Valley, Vedic Age Medieval Indian History - Delhi Sultanate, Mughal Empire Modern Indian History - British Rule, Freedom Struggle Tamil Nadu History - Chola, Pandya, Pallava World History - Renaissance, Industrial Revolution Indian National Movement - Key Events and Leaders	25	31.25%
Geography	Physical Geography - Landforms, Climate, Rivers Indian Geography - States, Capitals, Physical Features Tamil Nadu Geography - Districts, Rivers, Climate Human Geography - Population, Migration, Settlement Environmental Geography - Conservation, Sustainability Map Work - India, Tamil Nadu, World	25	31.25%
Economics	Basic Economics Concepts - Scarcity, Choice Indian Economy - Sectors, Agriculture, Industry Economic Development - Indicators, Policies Money and Banking - Functions, RBI Budget and Taxation - Types, Benefits Global Economy - Trade, WTO, Globalization	15	18.75%
Civics	Indian Constitution - Preamble, Fundamental Rights Indian Democracy - Legislature, Executive, Judiciary Local Government - Panchayati Raj, Urban Local Bodies Citizen Rights and Duties Political System - Elections, Political Parties Social Issues - Poverty, Inequality, Discrimination	15	18.75%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)

Smart Preparation Tips Based on Weightage

Focus on High-Weightage Topics

Prioritize units with higher marks like Grammar (30), Literature (25) in Tamil, and Algebra (18), Geometry (18) in Mathematics.

Balance Subjects Effectively

Allocate study time proportionally to the weightage of each subject and unit.

Internal Assessment Matters

Don't ignore the 20 internal marks. Submit notebooks on time and participate in enrichment activities.

Practice Previous Papers

Solve previous year papers to understand the pattern and mark distribution better.

Frequently Asked Questions About Chapter Weightage

How is the chapter weightage useful for exam preparation?

Chapter weightage helps students prioritize their study time effectively. By knowing which chapters carry more marks, you can allocate more time to high-weightage topics while still covering all units. This strategic approach ensures better exam results with efficient preparation.

Does the chapter weightage change every year?

The chapter weightage is generally consistent year to year, but it's advisable to check the official TNBSE website for any updates. Minor changes may occur based on curriculum revisions or new educational policies.

Can I skip low-weightage chapters?

While it's tempting to skip low-weightage chapters, it's not recommended. Every chapter contributes to your total score. Instead, give them a quick review and focus on key concepts. A basic understanding of all chapters is essential for overall success.

How does the internal assessment weightage work?

Internal assessment carries 20 marks per subject. It includes periodic tests (10 marks), notebook submission (5 marks), and subject enrichment activities/project work (5 marks). These marks are added to your theory scores to determine your final grade.

What is the passing criteria for Tamil Nadu Board Class 8?

Students must secure a minimum of 35% marks in each subject to pass. This applies to both theory and internal assessment components combined. Failure in any subject requires re-examination.