Tamil Nadu Board Class 12 Science Exam Pattern 2026-27
Complete TNBSE Class 12 Science Board Exam Marking Scheme & Assessment Structure
70-80 Theory + 20-30 Internal • 3 Hours Duration • 35% Passing Criteria
70-80 Theory Marks
20-30 Internal Marks
3 Hours Duration
35% Passing Criteria
Tamil Nadu Board Class 12 Science Board Exam Overview 2026-27
Exam Duration
3 Hours per subject
Total Marks
100 per subject
Theory Marks
70-80 per subject
Passing Marks
35% in each subject
Important: Students must secure a minimum of 35% marks in each subject to pass the board examination. The marks are calculated by combining theory and internal assessment scores. Failure in any subject requires supplementary examination.
Assessment Structure
Theory Examination (70-80 Marks)
- Physics & Mathematics: 80 marks theory
- Chemistry & Biology: 70 marks theory
- Question Types: Objective, Short Answer, Long Answer
- Duration: 3 hours per subject
- Coverage: Full syllabus as prescribed by TNBSE
- Numerical Problems: Included in Physics and Mathematics
- Diagram-based Questions: Included in Physics and Biology
- Map Work: Not applicable for Science stream
Internal Assessment (20-30 Marks)
- Periodic Tests (10 marks): Three periodic tests throughout the year
- Notebook Submission (5 marks): Regular notebook maintenance
- Subject Enrichment (5 marks): Project work, activities, practicals
- Practical Work (10 marks): Science laboratory experiments (Chemistry & Biology)
- Project Work: Subject-specific projects and presentations
- Oral Tests: Speaking and listening skills evaluation (Languages)
Subject-Wise Marking Scheme 2026-27
| Subject | Theory | Internal | Total | Duration | Passing |
|---|---|---|---|---|---|
| Physics | 80 | 20 | 100 | 3 hours | 35% |
| Chemistry | 70 | 30 | 100 | 3 hours | 35% |
| Biology | 70 | 30 | 100 | 3 hours | 35% |
| Mathematics | 80 | 20 | 100 | 3 hours | 35% |
| English | 80 | 20 | 100 | 3 hours | 35% |
| Tamil | 80 | 20 | 100 | 3 hours | 35% |
Note: Physics and Mathematics have 80 marks theory with 20 marks internal. Chemistry and Biology have 70 marks theory with 30 marks internal (including practical). Languages have 80 marks theory with 20 marks internal.
Subject-Wise Board Exam Pattern 2026-27
Physics Board Exam Pattern - 80 Marks
| Section | Question Type | Marks |
|---|---|---|
| Section A | Objective Questions (MCQs, Fill in the blanks, True/False, Match the following) | 20 |
| Section B | Short Answer Questions (2-3 mark questions) | 25 |
| Section C | Long Answer Questions (4-5 mark questions) | 25 |
| Section D | Numerical Problems (6-8 mark questions) | 10 |
| Total | 80 | |
Tip: Practice numerical problems regularly. Show complete steps in long answer questions. Marks are awarded for the method and approach, not just the final answer.
Chemistry Board Exam Pattern - 70 Marks
| Section | Question Type | Marks |
|---|---|---|
| Section A | Objective Questions (MCQs, Fill in the blanks, True/False) | 15 |
| Section B | Short Answer Questions (2-3 mark questions) | 20 |
| Section C | Long Answer Questions (4-5 mark questions) | 20 |
| Section D | Chemical Reactions and Equations (6 mark questions) | 15 |
| Total | 70 | |
Biology Board Exam Pattern - 70 Marks
| Section | Question Type | Marks |
|---|---|---|
| Section A | Objective Questions (MCQs, Fill in the blanks, True/False) | 15 |
| Section B | Short Answer Questions (2-3 mark questions) | 20 |
| Section C | Long Answer Questions (4-5 mark questions) | 20 |
| Section D | Diagram-based Questions (6 mark questions) | 15 |
| Total | 70 | |
Mathematics Board Exam Pattern - 80 Marks
| Section | Question Type | Marks |
|---|---|---|
| Section A | Objective Questions (MCQs, Fill in the blanks, True/False) | 20 |
| Section B | Short Answer Questions (2-3 mark questions) | 25 |
| Section C | Long Answer Questions (4-5 mark questions) | 25 |
| Section D | Higher Order Thinking Questions (6 mark questions) | 10 |
| Total | 80 | |
English & Tamil Board Exam Pattern - 80 Marks
| Section | Question Type | Marks |
|---|---|---|
| Section A | Objective Questions (MCQs, Fill in the blanks, True/False) | 20 |
| Section B | Short Answer Questions (2-3 mark questions) | 25 |
| Section C | Long Answer Questions (4-5 mark questions) | 25 |
| Section D | Grammar, Composition, and Literature-based Questions | 10 |
| Total | 80 | |
Passing Criteria & Promotion Rules
Minimum Marks
35% in each subject
Combined theory + internal
Internal Assessment
Mandatory
20-30 marks per subject
Promotion
Must pass all subjects
Eligible for higher education
Important: Students must secure a minimum of 35% marks in each subject to pass the board examination. Failure in any subject requires supplementary examination. Passing the board exam is mandatory for higher education admissions.
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