CBSE Class 12 Deleted Syllabus 2026-27: Subject-Wise Rationalized Topics PDF

• Pooja Singh
• January 27, 2026

The Central Board of Secondary Education (CBSE) periodically reviews and updates its curriculum to align with contemporary educational needs and standards. In the wake of the National Education Policy (NEP) 2020, CBSE has implemented Syllabus Rationalization for Class 12, involving the removal of redundant or overlapping portions. This comprehensive guide aims to provide an in-depth analysis of the CBSE Class 12th deleted syllabus for the 2026-2027 session, exploring the reasons behind these changes and their implications for your board preparation.

The “Rationalization” Context: Why Deletions Occur

It is critical to note that CBSE officially refers to these changes as “Rationalization of Content.” The primary goal is to avoid content overlap across different classes (Classes 6-12) and to provide a “streamlined” curriculum that focuses on core competencies. This ensures you spend your time on high-impact learning rather than redundant information.

Overview of Rationalized Syllabus 2026-2027:

1. Mathematics:

   CBSE has implemented targeted reductions in the class 12^th Math syllabus. Contrary to rumors, core pillars like Calculus and Algebra remain central (weighted at 35 and 10 marks respectively). However, specific topics like composite functions, inverse trigonometric graphs, and the properties of determinants (Section 4.3) have been removed to reduce the technical burden.

2. Physics:

   The rationalization in Physics aims to boost your conceptual clarity. While core chapters remain, specific complex derivations and non-essential theories like the Mirror Formula derivation (Ch 9) and Carbon Resistor color coding (Ch 3) have been scrapped. Experiments like the ‘Metre Bridge’ for resistor combinations have also been modified.

3. Chemistry:

   The goal is to focus on high-weightage sections of Organic and Physical Chemistry. Chapters like Solid State, Surface Chemistry, and p-Block Elements have been modified significantly in the latest rationalized editions.

4. Biology:

   Certain topics like Reproduction in Organisms and Environmental Issues have been excluded to keep the focus on advanced Genetics and Biotechnology (weighted at 20 and 12 marks).

Important Note: No questions will be asked from the deleted syllabus in the CBSE Class 12 board exams in 2026-2027.

Detailed Rationalized Topics Table (2026-27)

New CBSE Test Pattern & Internal Assessment (2026-27)

Along with the syllabus reduction, we have observed a massive shift in how you will be evaluated. For the 2026-2027 session, 50% of the paper consists of Competency-Focused Questions. The total 100-mark breakdown is as follows:

• 80 Marks Theory Paper: 20% MCQs, 50% Competency-based (Case/Source study), and 30% Short/Long answers.
• 20 Marks Internal Assessment: For English, this includes Listening (5), Speaking (5), and Project Work (10). For Commerce, it is dedicated to Project Files and Viva Voce.

How to Download Rationalized Syllabus PDF

1. Visit the official portal at cbseacademic.nic.in.
2. Navigate to the “Curriculum” tab on the top menu.
3. Select “Senior Secondary Curriculum (XI-XII)” for the 2026-27 session.
4. Click on your specific subject to download the PDF directly.

Impact on Entrance Exams (JEE/NEET)

A common concern is whether these deletions apply to JEE or NEET. It is critical to note that the NTA (National Testing Agency) maintains its own syllabus. Often, topics rationalized by CBSE are still required for competitive exams. We recommend checking the latest NTA 2026 brochures before skipping these topics.

Frequently Asked Questions

Is syllabus reduced for class 12 2026-2027?
Yes, CBSE has maintained the rationalized curriculum, reducing the Class 12 syllabus by approximately 30% to align with NEP 2020 standards.

Are practical exams affected by these deletions?
Yes, syllabus reduction affects the list of mandatory experiments. Students should check the 2026-27 practical list as experiments like the Potentiometer or Carbon Resistor studies have been modified or scrapped.

Important Links

Official CBSE Academic Curriculum Portal

Check Class 10 Rationalized Syllabus

Conclusion!

The CBSE Class 12th Deleted Syllabus is a strategic move to help you focus on quality over quantity. We believe that understanding these changes early will give you a significant edge in your board preparation. Both teachers and students must comprehend the rationalized content to plan their tasks effectively.

References & Authority Sources:

• CBSE Secondary Curriculum 2026-27 – Official Release
• NCERT Rationalised Content Guide (Latest Edition)