Academic Session 2026-27

Tamil Nadu Board Class 10 Important Chapters 2026-27

Key Topics & High-Weightage Chapters for TNBSE Class 10 Board Exams

5 Subjects • Most Important Chapters • Focus Areas • Exam Priority Topics

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5 Subjects High-Weightage Chapters Board Exam Focus Priority Topics

Important Chapters for Board Exams 2026-27

Focus on these high-priority chapters for effective board exam preparation and maximum scores.

Tamil (தமிழ்) - Important Chapters

Unit	Important Topics	Priority
இலக்கியம் (Literature)	கற்பனை இலக்கியம் - கவிதை மற்றும் உரைநடை உரைநடை இலக்கியம் - சிறுகதை, கட்டுரை இலக்கியப் படைப்பாளர்கள் - தஞ்சை, திருவள்ளுவர் இலக்கிய வகைகள் - உரைநடை, கவிதை, நாடகம் தமிழ் இலக்கியத்தின் சிறப்பம்சங்கள்	High
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	Very High
உரைநடை (Composition)	கட்டுரை எழுதுதல் - விளக்கவுரை, விவரணை கடிதம் எழுதுதல் - முறையான, முறைசாரா சுருக்கம் எழுதுதல் - கருத்து சுருக்கம் கதை எழுதுதல் - படைப்பு எழுத்து	High
நாடகம் (Drama)	நாடக இலக்கிய வகைகள் தேர்ந்தெடுக்கப்பட்ட நாடகங்கள் நாடகத்தின் கூறுகள்	Medium

English - Important Chapters

Unit	Important Topics	Priority
Reading Comprehension	Unseen passages with comprehension questions Inference and analytical questions Summary writing from passages Advanced vocabulary building	High
Prose	Selected prose pieces from prescribed textbook Character analysis and plot study Thematic and stylistic analysis Author introduction and literary contribution	Very High
Poetry	Selected poems from prescribed textbook Poetic devices and analysis Rhyme scheme and meter study Meaning and interpretation	High
Grammar	Tenses - Present, Past, Future (All forms) Active and Passive Voice Direct and Indirect Speech Subject-Verb Agreement Error Correction Parts of Speech - Noun, Pronoun, Verb, Adjective, Adverb	Very High
Writing Skills	Essay Writing - Descriptive, Narrative, Argumentative Letter Writing - Formal, Informal, Business Story Writing with given clues Precis Writing and Summary	Medium

Mathematics - Important Chapters

Unit	Important Topics	Priority
Algebra	Polynomials - Types, Zeros, Factor Theorem Linear Equations in Two Variables Quadratic Equations - Solving Methods Arithmetic Progressions - nth term, Sum Algebraic Expressions and Identities	Very High
Geometry	Triangles - Similarity, Pythagoras Theorem Circles - Tangents, Secants, Properties Coordinate Geometry - Distance, Section Formula Constructions - Geometric Constructions	High
Trigonometry	Introduction to Trigonometry - Ratios Trigonometric Identities Heights and Distances - Applications Angles of Elevation and Depression	High
Mensuration	Area of Plane Figures - Triangle, Quadrilateral, Circle Surface Area and Volume of Cubes, Cuboids, Cylinders Surface Area and Volume of Cones, Spheres, Hemispheres Frustum of a Cone	High
Statistics	Mean, Median, Mode - Grouped and Ungrouped Data Graphical Representation - Bar Graph, Histogram, Ogive Probability - Basic Concepts	Medium
Number Systems	Real Numbers - Euclid's Division Lemma Rational and Irrational Numbers Exponents and Powers	Medium

Science - Important Chapters

Unit	Important Topics	Priority
Physics	Light - Reflection and Refraction Human Eye and Colourful World Electricity - Ohm's Law, Circuits Magnetic Effects of Electric Current Sources of Energy	Very High
Chemistry	Chemical Reactions and Equations Acids, Bases and Salts Metals and Non-Metals Carbon and its Compounds Periodic Classification of Elements	High
Biology	Life Processes - Nutrition, Respiration, Transport Control and Coordination - Nervous and Endocrine System Reproduction in Organisms Heredity and Evolution Our Environment - Ecosystem, Food Chain	High
Environmental Science	Management of Natural Resources Sustainable Development Pollution Control	Medium

Social Science - Important Chapters

Unit	Important Topics	Priority
History	Nationalism in India - Freedom Struggle Nationalism in Europe The Making of a Global World The Age of Industrialisation Indian National Movement (1885-1947) Tamil Nadu's Role in Freedom Struggle	Very High
Geography	Resources and Development Agriculture - Types and Crops Minerals and Energy Resources Manufacturing Industries Map Work - India, Tamil Nadu Geography of Tamil Nadu - Districts, Rivers, Climate	High
Political Science	Power Sharing - Forms and Importance Federalism - Indian Context Political Parties - National and State Outcomes of Democracy	High
Economics	Sectors of Indian Economy Money and Credit - Banking System Globalisation and the Indian Economy Consumer Rights and Awareness Economy of Tamil Nadu	Medium

Chapter-wise Marks Breakdown

Tamil & English

• Tamil: இலக்கணம் (30 marks) - Highest weightage
• Tamil: இலக்கியம் (25 marks) - High weightage
• English: Grammar (20 marks) - Highest weightage
• English: Prose (20 marks) - High weightage
• English: Reading Comprehension (15 marks) - High weightage

Mathematics

• Algebra: 20 marks - Highest weightage
• Geometry: 16 marks - High weightage
• Trigonometry: 12 marks - Important
• Mensuration: 12 marks - Important
• Statistics: 12 marks - Important

Science

• Physics: 28 marks - Highest weightage
• Biology: 28 marks - Highest weightage
• Chemistry: 24 marks - High weightage
• Diagram-based questions: 4-5 marks
• Practical-based questions: 4-5 marks

Social Science

• History: 20 marks - Highest weightage
• Geography: 20 marks - Highest weightage
• Political Science: 20 marks - High weightage
• Economics: 20 marks - High weightage
• Map Work: 4-5 marks

How to Use This Chapter List for Board Exam Preparation

Prioritize High-Weightage Chapters

Focus first on chapters marked "Very High" and "High" priority

Create Chapter-wise Timetable

Allocate more time to important chapters in your study schedule

Practice Previous Year Questions

Focus on questions from these chapters in previous board exams

Revise Multiple Times

Revise high-priority chapters multiple times before the exam

Success Strategy: Master the "Very High" priority chapters first. These chapters typically cover 60-70% of the exam marks. Once you're confident with these, move to "High" priority chapters. Finally, revise "Medium" priority chapters for completeness.

Important Formulas & Concepts to Remember

Mathematics Formulas

• Algebra: (a+b)² = a² + 2ab + b²
• Algebra: (a-b)² = a² - 2ab + b²
• Algebra: a² - b² = (a-b)(a+b)
• Trigonometry: sin²θ + cos²θ = 1
• Mensuration: Volume of Cylinder = πr²h
• Mensuration: Volume of Cone = ⅓πr²h
• Statistics: Mean = Σx/n

Science Key Concepts

• Ohm's Law: V = IR
• Power: P = VI = I²R
• Laws of Reflection: angle of incidence = angle of reflection
• pH Scale: 0-6 acidic, 7 neutral, 8-14 basic
• Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
• Respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy
• Chemical Reactions: Balance equations