In short: Tamil Nadu HSC 2027 starts March 3. From November 23, you have 100 days. This guide covers Science (PCM and PCB) and Commerce streams with chapter weightage, gap day strategy, and TN HSC-specific preparation tips.
Last updated: October 29, 2026. Source: dge.tn.gov.in
TN HSC 2027 — Key Dates
| Subject | Exam Date (Expected) |
|---|---|
| Tamil Paper I | March 3, 2027 |
| Tamil Paper II | March 4, 2027 |
| English Paper I | March 5, 2027 |
| English Paper II | March 6, 2027 |
| Physics | March 8, 2027 |
| Chemistry | March 10, 2027 |
| Mathematics | March 12, 2027 |
| Biology | March 15, 2027 |
| Computer Science | March 17, 2027 |
| Accountancy | March 8, 2027 |
| Commerce | March 10, 2027 |
| Economics | March 12, 2027 |
Note: Official timetable from DGE Tamil Nadu. Check dge.tn.gov.in for confirmed dates.
Source: DGE Tamil Nadu — dge.tn.gov.in
TN HSC Exam Pattern
| Subject | Theory | Practical | Total |
|---|---|---|---|
| Tamil | 100 | — | 100 |
| English | 100 | — | 100 |
| Physics | 70 | 30 | 100 |
| Chemistry | 70 | 30 | 100 |
| Mathematics | 100 | — | 100 |
| Biology | 70 | 30 | 100 |
| Computer Science | 70 | 30 | 100 |
| Accountancy | 90 | 10 | 100 |
| Commerce | 100 | — | 100 |
| Economics | 100 | — | 100 |
Passing criteria: 35 marks in theory component of each subject.
100-Day Plan — Science Stream (PCM)
Phase 1: Syllabus Completion (Nov 23 – Jan 7, 6 weeks)
| Week | Physics | Chemistry | Maths |
|---|---|---|---|
| 1 | Electrostatics | Solutions | Relations & Functions |
| 2 | Current Electricity | Electrochemistry | Matrices & Determinants |
| 3 | Magnetism | Chemical Kinetics | Calculus (Differentiation) |
| 4 | Electromagnetic Induction | d-block Elements | Calculus (Integration) |
| 5 | Optics | Organic Chemistry | Differential Equations |
| 6 | Modern Physics | Biomolecules | Probability |
Phase 2: First Revision (Jan 8 – Feb 1, 4 weeks)
| Week | Focus |
|---|---|
| 7 | Physics — derivations + numericals |
| 8 | Chemistry — reactions + numericals |
| 9 | Maths — integration + matrices |
| 10 | All subjects — formula sheets |
Phase 3: Previous Year Papers (Feb 2 – Feb 22, 3 weeks)
| Day | Activity |
|---|---|
| Day 1-3 | Physics PYP × 2 + analysis |
| Day 4-6 | Chemistry PYP × 2 + analysis |
| Day 7-9 | Maths PYP × 2 + analysis |
| Day 10-12 | Tamil + English PYP |
| Day 13-15 | Weak areas revision |
Phase 4: Final Revision (Feb 23 – Mar 2)
- Formula sheets only
- Key derivations
- Important diagrams
- No new topics
Physics — Chapter-wise Weightage
| Chapter | Marks (approx.) | Priority |
|---|---|---|
| Electrostatics | 8-10 | High |
| Current Electricity | 8-10 | High |
| Magnetism and Magnetic Effects | 8-10 | High |
| Electromagnetic Induction | 6-8 | High |
| Alternating Current | 4-6 | Medium |
| Optics (Ray + Wave) | 10-12 | High |
| Dual Nature | 4-6 | Medium |
| Atoms and Nuclei | 4-6 | Medium |
| Semiconductor Electronics | 6-8 | High |
| Communication Systems | 2-4 | Low |
TN Physics tip: Derivations are heavily tested — 5-6 derivations asked every year. Prepare: Coulomb's law, Biot-Savart law, Faraday's law, lens formula, de Broglie wavelength, Bohr's model.
Most important numericals:
- Capacitance (series/parallel)
- Ohm's law + Kirchhoff's laws
- Magnetic force on conductor
- Lens formula + mirror formula
- Photoelectric effect
Practice any chapter on Padhaao
AI tutor for CBSE, ICSE & 15 state boards · 10 learning modes · 3 free chapters daily
Chemistry — Chapter-wise Weightage
| Chapter | Marks (approx.) | Priority |
|---|---|---|
| Solutions | 6-8 | High |
| Electrochemistry | 6-8 | High |
| Chemical Kinetics | 6-8 | High |
| Surface Chemistry | 4-5 | Medium |
| d and f Block Elements | 6-8 | High |
| Coordination Compounds | 6-8 | High |
| Haloalkanes | 4-6 | Medium |
| Alcohols, Phenols, Ethers | 4-6 | Medium |
| Aldehydes, Ketones | 6-8 | High |
| Amines | 4-6 | Medium |
| Biomolecules | 4-5 | Medium |
| Polymers | 3-4 | Low |
TN Chemistry tip: Organic reactions are the highest-scoring area. Prepare all named reactions: Aldol condensation, Cannizzaro, Reimer-Tiemann, Kolbe's reaction, Sandmeyer reaction.
Mathematics — Chapter-wise Weightage
| Chapter | Marks (approx.) | Priority |
|---|---|---|
| Relations and Functions | 6-8 | High |
| Inverse Trigonometric Functions | 4-6 | Medium |
| Matrices and Determinants | 10-12 | High |
| Continuity and Differentiability | 8-10 | High |
| Applications of Derivatives | 6-8 | High |
| Integrals | 12-15 | High |
| Applications of Integrals | 4-6 | Medium |
| Differential Equations | 6-8 | High |
| Vector Algebra | 6-8 | High |
| 3D Geometry | 6-8 | High |
| Linear Programming | 4-6 | Medium |
| Probability | 6-8 | High |
TN Maths tip: Integration is the highest-weightage chapter — 12-15 marks. Practice daily. Standard forms, substitution, integration by parts, definite integrals.
Biology (PCB) — Chapter-wise Weightage
| Chapter | Marks (approx.) | Priority |
|---|---|---|
| Reproduction in Organisms | 6-8 | High |
| Sexual Reproduction in Flowering Plants | 8-10 | High |
| Human Reproduction | 8-10 | High |
| Reproductive Health | 4-5 | Medium |
| Principles of Inheritance | 8-10 | High |
| Molecular Basis of Inheritance | 8-10 | High |
| Evolution | 4-6 | Medium |
| Human Health and Disease | 6-8 | High |
| Biotechnology | 6-8 | High |
| Ecology | 6-8 | High |
TN Biology tip: Diagrams are heavily tested. Prepare: flower structure, human reproductive system, DNA replication, PCR, lac operon, food chain/web.
Commerce Stream — Subject-wise Strategy
Accountancy (90 marks theory + 10 marks practical)
Priority topics:
- Partnership accounts — 25-30 marks
- Company accounts — 20-25 marks
- Financial statements analysis — 15-20 marks
- Cash flow statement — 10-15 marks
Commerce (100 marks)
Priority topics:
- Business organisation — 20-25 marks
- Trade and commerce — 15-20 marks
- Banking — 15-20 marks
- Insurance — 10-15 marks
Economics (100 marks)
Priority topics:
- National Income — 15-20 marks
- Demand and Supply — 15-20 marks
- Money and Banking — 10-15 marks
- Indian Economy — 15-20 marks
Gap Day Strategy — March 3-17
| Gap | Subjects | Strategy |
|---|---|---|
| Mar 3-4 (1 day) | Tamil I → Tamil II | Tamil grammar + writing |
| Mar 4-5 (1 day) | Tamil II → English I | English grammar |
| Mar 5-6 (1 day) | English I → English II | Literature revision |
| Mar 6-8 (2 days) | English II → Physics/Accounts | Physics: derivations + numericals |
| Mar 8-10 (2 days) | Physics → Chemistry/Commerce | Chemistry: organic reactions |
| Mar 10-12 (2 days) | Chemistry → Maths/Economics | Maths: integration practice |
| Mar 12-15 (3 days) | Maths → Biology | Biology: diagrams + genetics |
| Mar 15-17 (2 days) | Biology → CS | CS: programs + theory |
Frequently Asked Questions
What is the passing marks for TN HSC?
35 marks in the theory component of each subject. For subjects with practicals (Physics, Chemistry, Biology), 35 marks in the 70-mark theory paper.
Is TN HSC harder than CBSE?
Different, not harder. TN HSC has a different syllabus and question pattern. TN Board questions tend to be more direct and textbook-based. CBSE has more application-based questions.
Where can I get previous year TN HSC papers?
DGE Tamil Nadu releases previous year papers at dge.tn.gov.in. Also available in Sura, Guide, and other TN Board publications.
Does TN HSC score affect NEET/JEE eligibility?
Yes. You must pass TN HSC with Physics, Chemistry, and Maths/Biology to be eligible for JEE/NEET. The percentage doesn't directly affect JEE/NEET rank but affects college admission through state quota.
What is the TN Engineering Entrance (TNEA)?
TNEA (Tamil Nadu Engineering Admissions) uses only Class 12 marks — no separate entrance exam. Higher HSC percentage = better TNEA rank. This makes HSC marks extremely important for engineering admissions in Tamil Nadu.
Where can I check the latest official information?
Use the official sources listed at the end of this guide: DGE Tamil Nadu, TN HSC timetable 2027, TN HSC previous year papers. Dates and rules can change, so check the latest notice there before you act on anything here.
Related Guides
- Tamil Nadu SSLC Class 10 — Subject Wise Last 100 Days Before March 17, 2027
- All Board Exams 2027 Master Calendar
- Board Exam Revision Planner 2027
- Tamil Nadu Class 12 Last 100 Days Plan 2027 — Before March 3
- How to Score 90% in Tamil Nadu HSC 2027 — Subject-Wise Plan
- Tamil Nadu HSC Class 12 Science Important Questions 2027 - Physics Chemistry Biology
Sources
- DGE Tamil Nadu — dge.tn.gov.in
- TN HSC timetable 2027 — dge.tn.gov.in
- TN HSC previous year papers — dge.tn.gov.in
- TNEA admissions — tneaonline.org
₹21/mo (annual plan)
Padhaao covers 17,000+ chapters across 17 boards
Your exact syllabus. 10 learning modes. 3 free daily. Pro for unlimited - ₹21/month (annual plan).
Want the full chapter with solved examples?
10 learning modes. Board-specific content. 3 free chapters every day.
Try it free