CBSE Class 12 Science

CBSE Class 12 Science Exam Pattern 2026-27

Complete Marking Scheme, Question Paper Pattern & Practical Assessment

Understand the CBSE Class 12 Science exam structure, marks distribution, and assessment criteria for the academic year 2026-27. Your complete guide to CBSE Class 12 Science board examinations.

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CBSE Class 12 Science Exam Structure 2026-27

CBSE Class 12 Science follows a comprehensive evaluation pattern with periodic assessments, pre-board examinations, and the final board examination for the academic year 2026-27.

PT

Periodic Tests

3-4 tests per year
10 marks each

PB

Pre-Board Exams

2 exams (Dec 2026 & Jan 2027)
70-80 marks each

BE

Board Exam

February-March 2027
70-80 marks

IA

Internal Assessment

Throughout the year
20-30 marks

Total Marks per Subject: 70 marks (Theory) + 30 marks (Practical) = 100 marks for Physics, Chemistry, Biology.
Mathematics: 80 marks (Theory) + 20 marks (Internal) = 100 marks

CBSE Class 12 Physics Exam Pattern 2026-27

Component	Marks	Details
Theory Paper	70	3 hours duration
Practical Assessment	30	Experiments + Record + Viva
Total	100	—

Theory Paper Structure

• Section A: MCQs (20 marks)
• Section B: Very Short Answer (20 marks)
• Section C: Short Answer (18 marks)
• Section D: Long Answer (12 marks)

Practical Assessment

• Two Experiments: 12 marks
• Practical Record: 6 marks
• Project: 6 marks
• Viva Voce: 6 marks

CBSE Class 12 Chemistry Exam Pattern 2026-27

Component	Marks	Details
Theory Paper	70	3 hours duration
Practical Assessment	30	Volumetric + Qualitative + Record + Viva
Total	100	—

Theory Paper Structure

• Section A: MCQs (20 marks)
• Section B: Very Short Answer (20 marks)
• Section C: Short Answer (18 marks)
• Section D: Long Answer (12 marks)

Practical Assessment

• Volumetric Analysis: 8 marks
• Qualitative Analysis: 8 marks
• Practical Record: 6 marks
• Project: 4 marks
• Viva Voce: 4 marks

CBSE Class 12 Biology Exam Pattern 2026-27

Component	Marks	Details
Theory Paper	70	3 hours duration
Practical Assessment	30	Experiments + Record + Project + Viva
Total	100	—

Theory Paper Structure

• Section A: MCQs (20 marks)
• Section B: Very Short Answer (20 marks)
• Section C: Short Answer (18 marks)
• Section D: Long Answer (12 marks)

Practical Assessment

• Major Experiment: 8 marks
• Minor Experiment: 6 marks
• Practical Record: 6 marks
• Project: 5 marks
• Viva Voce: 5 marks

CBSE Class 12 Mathematics Exam Pattern 2026-27

Component	Marks	Details
Theory Paper	80	3 hours duration
Internal Assessment	20	Periodic Tests + Notebook + Enrichment
Total	100	—

Theory Paper Structure

• Section A: MCQs (20 marks)
• Section B: Very Short Answer (20 marks)
• Section C: Short Answer (20 marks)
• Section D: Long Answer (20 marks)

Internal Assessment

• Periodic Tests: 10 marks
• Notebook Submission: 5 marks
• Subject Enrichment: 5 marks

CBSE Class 12 Science Practical Assessment 2026-27

Subject	Total Practical Marks	Breakdown
Physics	30	Experiments (12) + Record (6) + Project (6) + Viva (6)
Chemistry	30	Volumetric (8) + Qualitative (8) + Record (6) + Project (4) + Viva (4)
Biology	30	Major Exp (8) + Minor Exp (6) + Record (6) + Project (5) + Viva (5)
Mathematics	20	Periodic Tests (10) + Notebook (5) + Enrichment (5)

Pro Tip: Practical assessment carries 30% of your total marks in Science subjects. Pay equal attention to practical work, record keeping, and viva preparation.

Board Exam Preparation Tips 2026-27

Before the Board Exam

• Complete the syllabus at least 2 months before exams
• Start revision at least 1 month before exams
• Solve previous years' board papers (2015-2025)
• Take mock tests under timed conditions
• Focus on weak areas and clarify doubts
• Practice sample papers released by CBSE

During the Board Exam

• Read the question paper carefully (15 minutes reading time)
• Allocate time wisely to each section
• Start with easy questions to build confidence
• Write neat and structured answers
• Use keywords and underline important points
• Review your answers before submitting

Board Exam Day Checklist

Carry admit card

Carry stationery

Reach exam center early

Stay calm and confident

Frequently Asked Questions

What is the exam pattern for CBSE Class 12 Science in 2026-27?

CBSE Class 12 Science follows a comprehensive exam pattern with 70 marks theory and 30 marks practical for Physics, Chemistry, and Biology. Mathematics has 80 marks theory and 20 marks internal assessment.

How many marks is the practical exam in CBSE Class 12 Science?

The practical exam in CBSE Class 12 Science is 30 marks for Physics, Chemistry, and Biology. It includes experiments, practical record, project work, and viva voce.

What is the duration of CBSE Class 12 Science exams?

All CBSE Class 12 Science theory exams are 3 hours long. Students get 15 minutes of reading time before the exam starts.

How can StudyDecode help me with CBSE Class 12 Science board exams?

StudyDecode provides comprehensive guidance for CBSE Class 12 Science students. We help you understand the exam pattern, prepare effectively for theory and practical exams, and build confidence. Book a free consultation to know more.