Academic Session 2026-27

Tamil Nadu Board Class 10 Chapter Weightage 2026-27

Complete Board Exam Mark Distribution for TNBSE Class 10 All Subjects

5 Subjects • Chapter-wise Marks • 80 Theory + 20 Internal • Plan Your Board Exam Preparation

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

Chapter-wise Weightage for Board Exams 2026-27

Detailed mark distribution for each subject to help you prioritize your board exam 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 - உரைநடை, கவிதை, நாடகம்	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 - விளக்கவுரை, விவரணை கடிதம் எழுதுதல் - முறையான, முறைசாரா சுருக்கம் எழுதுதல் - கருத்து சுருக்கம் கதை எழுதுதல் - படைப்பு எழுத்து உரையாடல் எழுதுதல் விளம்பரம் எழுதுதல்	20	25%
நாடகம் (Drama)	நாடக இலக்கிய வகைகள் தேர்ந்தெடுக்கப்பட்ட நாடகங்கள் நாடகத்தின் கூறுகள்	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 Summary writing from passages Advanced vocabulary building	15	18.75%
Prose	Selected prose pieces from prescribed textbook Character analysis and plot study Thematic and stylistic analysis Author introduction and literary contribution	20	25%
Poetry	Selected poems from prescribed textbook Poetic devices and analysis Rhyme scheme and meter study Meaning and interpretation	15	18.75%
Grammar	Tenses - Present, Past, Future Active and Passive Voice Direct and Indirect Speech Subject-Verb Agreement Error Correction	20	25%
Writing Skills	Essay Writing - Descriptive, Narrative Letter Writing - Formal, Informal Story Writing with given clues Precis Writing and Summary	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	Real Numbers - Euclid's Division Lemma Rational and Irrational Numbers Exponents and Powers	8	10%
Algebra	Polynomials - Types, Zeros, Factor Theorem Linear Equations in Two Variables Quadratic Equations - Solving Methods Arithmetic Progressions - nth term, Sum Algebraic Expressions and Identities	20	25%
Geometry	Triangles - Similarity, Pythagoras Theorem Circles - Tangents, Secants, Properties Coordinate Geometry - Distance, Section Formula Constructions - Geometric Constructions	16	20%
Trigonometry	Introduction to Trigonometry - Ratios Trigonometric Identities Heights and Distances - Applications Angles of Elevation and Depression	12	15%
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	12	15%
Statistics	Mean, Median, Mode - Grouped and Ungrouped Data Graphical Representation - Bar Graph, Histogram, Ogive Probability - Basic Concepts	12	15%
Total		80	100%

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

Science - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
Physics	Light - Reflection and Refraction Human Eye and Colourful World Electricity - Ohm's Law, Circuits Magnetic Effects of Electric Current Sources of Energy	28	35%
Chemistry	Chemical Reactions and Equations Acids, Bases and Salts Metals and Non-Metals Carbon and its Compounds Periodic Classification of Elements	24	30%
Biology	Life Processes - Nutrition, Respiration, Transport Control and Coordination - Nervous and Endocrine System Reproduction in Organisms Heredity and Evolution Our Environment - Ecosystem, Food Chain	28	35%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)
Diagram-based questions: 4-5 marks included in Physics and Biology

Social Science - Chapter Weightage

Unit	Topics Covered	Marks	Weightage
History	Nationalism in India - Freedom Struggle Nationalism in Europe The Making of a Global World The Age of Industrialisation Indian National Movement (1885-1947)	20	25%
Geography	Resources and Development Agriculture - Types and Crops Minerals and Energy Resources Manufacturing Industries Geography of Tamil Nadu - Districts, Rivers, Climate	20	25%
Political Science	Power Sharing - Forms and Importance Federalism - Indian Context Political Parties - National and State Outcomes of Democracy	20	25%
Economics	Sectors of Indian Economy Money and Credit - Banking System Globalisation and the Indian Economy Consumer Rights and Awareness	20	25%
Total		80	100%

Internal Assessment: 20 marks (Periodic Tests - 10, Notebook - 5, Subject Enrichment - 5)
Map Work: 4-5 marks included in Geography

Smart Board Exam Preparation Tips Based on Weightage

Focus on High-Weightage Topics

Prioritize units with higher marks like Grammar in Tamil (30 marks), Algebra in Mathematics (20 marks), and Physics in Science (28 marks).

Balance Subjects Effectively

Allocate study time proportionally to the weightage of each subject. Subjects with higher weightage need more practice time.

Internal Assessment Matters

Don't ignore the 20 internal marks. Submit notebooks on time, participate in periodic tests, and complete subject enrichment activities.

Practice Previous Board Papers

Solve previous 5-10 years' board papers to understand the pattern and mark distribution better. Focus on questions from high-weightage topics.

Frequently Asked Questions About Chapter Weightage

How is the chapter weightage useful for board exam preparation?

Chapter weightage helps students prioritize their study time effectively for board exams. 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 board exam results with efficient preparation.

Does the chapter weightage change every year?

The chapter weightage is generally consistent from 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 for board exams?

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

What is the passing criteria for Tamil Nadu Board Class 10?

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

How can StudyDecode help with Tamil Nadu Board Class 10 preparation?

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