CBSE Class 12 Chapter Wise Weightage
When you start preparing for the CBSE Class 12 board exams in 2026, it is very important to know which chapters should be given priority based on their weightage of marks. When the competition is stiff and you have a desire to win, having a plan can be key.
For the CBSE Class 12 Board Exams, students must secure a minimum of 33% aggregate marks as well as 33% marks in each subject to pass. Those who obtain the overall passing percentage but fail to do so in an individual subject will have to take (take with a grain of salt idiom synonym) the Class 12 supplementary exam. The CBSE has also issued sample papers for Class 12 Board Exams, 2026, which will give a clear idea of the paper pattern of the question paper. Seeking help and referring to these papers, as well as the Chemistry Chapter Wise Weightage for Board, would help students have a set plan or strategy in hand while preparing for exams. Here is your cheat sheet for the CBSE class 12 chapter-wise weightage for 2026. This blog goes over the most important chapters in each subject, allowing you to concentrate your efforts where they can be most effective.
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CBSE Class 12 Exam Pattern Overview: Science
CBSE Class 12 exam for Math, Physics, Chemistry, Biology and English exam includes a theory paper as well as a practical/internal assessment for a maximum of 100 marks for each subject. For Science subjects (i.e Physics, Chemistry and Biology), theory will be of 70 marks & practical will be of 30 marks. Mathematics has an 80-mark theory paper and 20 marks for internal assessment. The detailed exam pattern and question paper pattern is given below:
Exam Pattern Overview (Science & Math)
| Component | Details |
| Mode of Exam | Conducted in offline format (pen and paper). |
| Time Limit | Students get 3 hours to finish each subject paper. |
| Marks Distribution | Each subject is scored out of 100 marks (includes theory + practical/project where applicable). |
| Practical / Internal Marks | Science (Physics, Chemistry, Biology): 70 marks theory + 30 marks practical
Mathematics: 80 marks theory + 20 marks internal assessment |
| Number of Subjects | Students must choose a minimum of 5 subjects and can go up to 6 subjects. |
| Passing Requirement (per subject) | To clear any subject, at least 33% marks are needed. |
| Overall Qualifying Rule | An aggregate of 33% or more across all subjects is required to pass. |
Question Paper Pattern (2025-26)
| Type of Question | Marks Share | What It Means |
| Short & Long Answers | Around 30% | Students have to write detailed answers in their own words. |
| Objective / MCQs | About 20% | One correct option has to be chosen from given choices. |
| Competency-Based | Nearly 50% | Covers MCQs, case-based, and source-based questions that test understanding and application. |
CBSE Physics Class 12 Chapter-wise Weightage 2026
CBSE Class 12 Physics Exam will be conducted in two parts: theory and practical. Both the CBSE 12th Physics Theory Board Exam as well as CBSE 12th Physics Practical Exam will be of 3-hour duration. The 12th Physics CBSE board theory exam will be of 70 Marks. Meanwhile, the CBSE 12th Physics Practical Exam will be of 30 Marks. Students preparing for CBSE Class 12 board exams can check the complete CBSE weightage of Physics Class 12 for both theory and practical exams below:
Check the weightage of Physics Class 12 CBSE for the theory exam in the table below:
| Unit | Chapters Included | Marks Allotted |
| Unit I: Electrostatics | Chapter 2: Electrostatic Potential and Capacitance
Chapter 1: Electric Charges and Fields |
16 Marks |
| Unit II: Current Electricity | Chapter 3: Current Electricity | |
| Unit III: Magnetic Effects of Current & Magnetism | Chapter 5: Magnetism and Matter
Chapter 4: Moving Charges and Magnetism |
17 Marks |
| Unit IV: Electromagnetic Induction & AC | Chapter 7: Alternating Current
Chapter 6: Electromagnetic Induction |
|
| Unit V: Electromagnetic Waves | Chapter 8: Electromagnetic Waves | 18 Marks |
| Unit VI: Optics | Chapter 10: Wave Optics
Chapter 9: Ray Optics & Optical Instruments |
|
| Unit VII: Dual Nature of Matter & Radiation | Chapter 11: Dual Nature of Radiation and Matter | 12 Marks |
| Unit VIII: Atoms & Nuclei | Chapter 13: Nuclei
Chapter 12: Atoms |
|
| Unit IX: Electronic Devices | Chapter 14: Semiconductor Electronics (Materials, Devices & Simple Circuits) | 7 Marks |
| Overall Marks | 70 Marks |
Check Out: CBSE Previous Year Question Papers Class 12 With Solutions Download
CBSE Class 12 Physics Board Weightage 2026 for Practical Exam
Check the Weightage of Physics Class 12 CBSE Practical exam in the table below:
| Component | Weightage (Marks) |
| Viva covering project, activities & experiments | 5 |
| Two experiments (one from each section) | 14 (7+7) |
| Practical notebook (record of activities & experiments) | 5 |
| Investigatory project | 3 |
| One activity (from any section) | 3 |
| Grand Total | 30 |
Class 12 CBSE Maths Chapter-wise Weightage
Mathematics is frequently seen as a game of numbers, and in the CBSE class 12 exams, some chapters receive higher scores than others. By checking the chapter-wise weightage, students can concentrate on key topics that are likely to appear in exams, improving their chances of success The following table outlines the estimated chapter-wise weightage based on previous years’ examinations. While official chapter-wise distribution may not be provided, this analysis helps students prioritize their studies:
| Unit | Chapters | Marks |
| Relations & Functions | Inverse Trigonometric Functions | 4 |
| Relations and Functions | 4 | |
| Algebra | Determinants | 5 |
| Matrices | 5 | |
| Calculus | Applications of the Integrals | 6 |
| Integrals | 9 | |
| Applications of Derivatives | 4 | |
| Differential Equations | 7 | |
| Continuity & Differentiability | 9 | |
| Vectors & 3D Geometry | Three-dimensional Geometry | 7 |
| Vectors | 7 | |
| Linear Programming | Linear Programming | 5 |
| Probability | Probability | 8 |
Among these, the three chapters with the highest weight are Calculus: Continuity and Differentiability (9 points), Integrals (9 marks), and Differential Equations (7 marks). Mastering these chapters not only improves your score but also boosts your fundamental grasp of mathematics.
Check Out: CBSE Class 12 Sample Papers with Solutions 2025-26 Exam
CBSE Class 12 Maths Board Practical Assessment Weightage
The internal assessment contributes significantly to the overall score. The breakdown is as follows:
|
Internal Assessment Marks Distribution |
|
| Assessment Elements | Maximum Marks |
| Mathematics Lab Activities | 10 |
| Two Best Scores from Class Tests | 10 |
| Overall Internal Evaluation | 20 |
Chemistry Class 12 CBSE Chapter-wise Weightage
Chemistry is one of the important subjects for Class 12 students in the science stream. To help students prepare effectively for the Class 12th board exams, we have provided the Weightage of Chemistry Class 12 Chapter Wise 2026 CBSE:
| Unit | Chapter Title | Expected Marks |
| Physical Chemistry | Electrochemistry | 9 |
| Chemical Kinetics | 7 | |
| Solutions | 7 | |
| Inorganic Chemistry | Coordination Compounds | 7 |
| d-Block & f-Block Elements | 7 | |
| Organic Chemistry | Aldehydes, Ketones & Carboxylic Acids | 8 |
| Amines | 6 | |
| Alcohols, Phenols & Ethers | 6 | |
| Haloalkanes & Haloarenes | 6 | |
| Biomolecules | 7 |
The year’s notable Chemistry topics are electrochemistry (9 marks), aldehydes, ketones, and carboxylic acid (8 marks), and solutions (7 marks). By prioritizing these chapters, you get more points and also expose yourself to a variety of topics vital to any scientific discipline.
CBSE Class 12 Chemistry Board Weightage 2026 for Practical Exam
The CBSE Class 12 Chemistry Practical Exam carries 30 marks. Here is the breakdown of the 30-mark practical exam:
| Activity/Component | Weightage |
| Project Submission | 4 marks |
| Class Record + Viva Voice | 4 marks |
| Qualitative Analysis (Salts) | 8 marks |
| Quantitative/Volumetric Test | 8 marks |
| Experiment Based on Content | 6 marks |
Class 12 CBSE Biology Chapter-wise Weightage
Biology, being the study of living organisms and systems, piques your interest in almost all chapters. However, understanding the following high-weightage chapters is essential to score on boards. The chapter-wise weightage is based on an analysis of past years’ papers. This breakdown helps students identify important topics, minor adjustments to the chapter-wise marks distribution may occur, so students are advised to prepare comprehensively.
| Unit | Topics Covered | Weightage (Marks) |
| Reproduction | Reproductive Health | 5 |
| Sexual Reproduction in Flowering Plants | 3 | |
| Human Reproduction | 8 | |
| Genetics & Evolution | Evolution | 5 |
| Molecular Basis of Inheritance | 10 | |
| Principles of Inheritance and Variation | 5 | |
| Biology & Human Welfare | Microbes in Human Welfare | 4 |
| Human Health and Diseases | 8 | |
| Biotechnology | Applications of Biotechnology | 4 |
| Biotechnology – Principles and Processes | 8 | |
| Ecology & Environment | Ecosystem | 3 |
| Biodiversity and its Conservation | 3 | |
| Organisms and Populations | 4 |
The chapters in Biology that you should not skip are Molecular Basis of Inheritance, which is worth 10 points; Human Reproduction, which is worth 8 points; and Human Health and Diseases, which is also worth 8 points. By learning these principles, you can improve your comprehension of important biological processes.
CBSE Class 12 Biology Board Weightage 2026 for Practical Exam
The CBSE Class 12 Biology Practical Exam, worth 30 marks. Here’s a breakdown of the practical exam components:
| Component | Marks |
| Slide Preparation | 5 Marks |
| Project Work | 5 Marks |
| Major Experiment | 9 Marks |
| Spotting | 7 Marks |
| Minor Experiment | Included in Major |
| Total | 30 Marks |
CBSE Class 12 English Chapter-wise Weightage
In today’s interconnected world, excellent communication skills are essential. Hence, English is an important subject for your board exams. The chapter weightage is as follows:
| Section | What it Includes | Marks |
| Reading Skills (Section A) |
|
22 (10 + 12) |
| Writing Skills (Section B) |
|
18 |
| Literature (Section C) |
|
40 |
In English, concentrate on Reading Comprehension Through Unseen Passages, which has a total weightage of 22 points. Furthermore, the Writing Skills such as Letter Writing and Article Writing require significant attention due to their cumulative weight. These sections can heavily contribute to your overall score.
Check Out: CBSE Class 12th Board Exam Preparation Tips 2026
CBSE Class 12 Board Exam Subject-Wise Preparation Tips
In order to prepare for the CBSE Class 12 Board Exams, it is important that you have a focused strategy, as each subject has its own different difficulty level and weightage of chapters. Instead of preparing in a haphazard manner, students must have the knowledge about the do’s and don’ts of their preparation for respective subjects. If you prepare the right way for Physics, Chemistry, Maths, Biology, English and other subjects, then you can judiciously manage time (race against time phrase meaning) according to priorities, focusing on high-scoring topics and enhancing performance in final exams.
Mathematics
- Formulas: Keep a running list of formulas to know for easy reference and review daily.
- Conceptual Clarity: How well you understand the concepts would matter above all, rather than mugging up.
- Practice Questions: Regularly solve from the NCERT books and other books to enhance your skills.
Physics
- Concepts & Derivations: Get to know the logic behind every formula and derivation.
- Numerical Practice: The more you solve numerical problems, the more your concept level will become clear.
- Diagrams: Practice drawing diagrams and learn what the important parts are and how to label them.
- SI Units: Know the proper SI units for all physical quantities.
Chemistry
- Syllabus: Read the syllabus carefully, and you should focus on fundamentals.
- Formulas: Make a list of important physical chemistry formulas and review them daily.
- Organic Chemistry: Put more emphasis on organic chemistry topics, reactions and mechanisms.
Biology
- Diagrams: Concentrate on learning and drawing out biological diagrams neatly.
- Descriptive notes, flowcharts: Writing descriptive notes and creating flowcharts can help in revision and memory recall.
- Applied Learning: Focus on the applied part and learn about what is happening biologically.
English
- Reading Practice: Read newspapers, novels, and other literature to enhance your reading comprehension skills.
- Daily Practice: Dedicate at least one hour daily to English to prevent taking it for granted.
- Writing Skills: Practice your writing skills, especially for comprehension, grammar, and literature sections.
Conclusion
As you prepare for board exams in 2026, understanding the class 12 chapter-wise weightage in each subject might significantly improve your preparation method. Concentrating on the most important areas, such as Calculus in Mathematics, Optics in Physics, Electrochemistry in Chemistry, and the Molecular Basis of Inheritance in Biology, allows you to not only improve your grades but also lay a solid foundation for further education.
Remember that while chapter-by-chapter weightage provides a strategic approach, a comprehensive understanding of the subject is vital. Deepening your understanding of each topic gives you the confidence to face any inquiry. The blueprints mentioned here are rooted in the most recent CBSE sample paper. But keep in mind that the real exam might differ. Unit-wise weightage is a safer bet instead of chapter-specific details. So, as you prepare, remember to plan accordingly for better performance.
FAQs on CBSE Class 12 Chapter Wise Weightage
Q1. Where can I find the CBSE Class 12 chapter wise weightage for board exams?
You may refer to the official CBSE curriculum and download some sample papers if you want to know chapter-wise weightage for Class 12 of each subject prepare for the exams. It assists the students to know what lessons are important from a marks point of view.
Q2. Why is it important to know CBSE Class 12 marks distribution chapter wise?
Knowing the marks distribution chapter wise Class 12 is useful as it will help you to concentrate on high-weightage topics, keep track of time and study accordingly.
Q3. Does CBSE Class 12 chapter wise weightage change every year?
Yes, CBSE can change the Class 12 chapter wise weightage slightly as per the revised syllabus, deleted portions and changes in exam pattern. Students should verify the most current curriculum.
Q4. How can I use CBSE Class 12 chapter wise marks weightage for better preparation?
Students can get to know the scoring areas by going through the chapter wise marks weightage Class 12, and revise certain important chapters more frequently and solve previous year question papers accordingly.
Q5. Is CBSE Class 12 Physics, Chemistry, and Maths chapter-wise weightage the same for all streams?
No, the chapter wise weightage of Class 12 subjects is different for Science, Commerce and Arts. The units have been assigned weightages according to the CBSE guidelines.
