CBSE Class 12 Science Sample Papers 2026-27: Download PDF, Exam Pattern & Marking Scheme
Download CBSE Class 12 Science sample papers 2026-27 for Physics, Chemistry, Maths & Biology with marking scheme. Get official links, exam pattern & prep tips.
Every year, lakhs of Class 12 Science students look for one thing before their board exams begin: the official CBSE sample question paper. It's the closest thing to a preview of the real exam — same pattern, same question typology, same marking logic. This guide covers everything Class 12 Science stream students need for the 2026-27 session: where to download the official PDFs, subject-wise details for Physics, Chemistry, Mathematics and Biology, the current exam pattern and marking scheme, and a practical strategy for using these papers to prepare.
What Are CBSE Class 12 Sample Papers 2026-27?
CBSE class 12 Sample Question Papers (SQPs) are official practice papers issued by the Central Board of Secondary Education through its academic portal, cbseacademic.nic.in. They are released along with a detailed Marking Scheme (MS) for every subject and are meant to give schools and students a clear template of how the board exam paper will be structured for that academic session.
CBSE typically releases Class 12 SQPs and marking schemes for the new academic session between mid-September and October, ahead of board exams held between February and April the following year. For the 2026-27 session (board exams in 2027), the sample papers are expected in this same window on the official CBSE Academic website.
Unlike previous-year question papers, which contain questions that were actually asked in past board exams, sample papers are designed to reflect the current year's blueprint — including any changes to question types, weightage, or section structure. That's why CBSE explicitly recommends using the current session's SQP over an older paper when preparing.
Why Science Stream Students Should Use the Official SQP
For Physics, Chemistry, Mathematics and Biology, the sample paper matters more than for most other subjects, because:
- Marking in numerical and derivation-based questions (Physics, Chemistry, Maths) is step-wise, and the official marking scheme shows exactly how partial marks are awarded.
- Biology and Chemistry theory papers increasingly include case-based and assertion-reason questions that test application, not memorisation.
- Practical/project components carry significant weight (20–30 marks), and the pattern of the theory paper only makes sense alongside this split.
Subject-Wise CBSE Class 12 Science Sample Papers 2026-27
Once released, CBSE publishes a separate SQP and MS PDF for each subject. Here's what to expect for the core Science-stream subjects:
| Subject | Sample Question Paper (SQP) | Marking Scheme (MS) |
|---|---|---|
| Physics | Download SQP | Download MS |
| Chemistry | Download SQP | Download MS |
| Mathematics | Download SQP | Download MS |
| Biology | Download SQP | Download MS |
| Applied Mathematics | Download SQP | Download MS |
| Biotechnology | Download SQP | Download MS |
| Computer Science | Download SQP | Download MS |
| Informatics Practices | Download SQP | Download MS |
| Subject | Theory Marks | Practical/Internal Marks | Total |
|---|---|---|---|
| Physics | 70 | 30 (Practical) | 100 |
| Chemistry | 70 | 30 (Practical) | 100 |
| Biology | 70 | 30 (Practical) | 100 |
| Mathematics | 80 | 20 (Internal Assessment) | 100 |
| Computer Science | 70 | 30 (Practical) | 100 |
| English Core (compulsory) | 80 | 20 (Internal Assessment) | 100 |
Note: This reflects the marking structure confirmed for the current CBSE Class 12 assessment scheme. Always cross-check the exact split against the official 2026-27 notification once released, as CBSE occasionally revises weightage.
Physics Sample Paper 2026-27
The Physics SQP typically follows a five-section structure (Sections A–E), moving from single-mark MCQs and assertion-reason questions to short-answer, long-answer and case-study-based questions drawn from units like Electrostatics, Current Electricity, Magnetism, Optics, and Modern Physics.
Chemistry Sample Paper 2026-27
Chemistry papers combine Physical, Organic and Inorganic Chemistry questions with numerical problems (especially from Electrochemistry and Chemical Kinetics) and case-based questions built around real-world applications of chemical concepts.
Mathematics Sample Paper 2026-27
The Maths SQP carries the highest theory weightage (80 marks) among core Science subjects and includes MCQs, assertion-reason questions, very short/short/long answer questions, and source-based or integrated case-study questions — with step marking applied throughout for derivations and multi-step problems.
Biology Sample Paper 2026-27
Biology papers test conceptual application through MCQs, short and long-answer questions, and case-based passages, drawing from units like Reproduction, Genetics and Evolution, Biology in Human Welfare, Biotechnology, and Ecology.
Other Science-Stream Subjects
Students who've opted for Computer Science, Informatics Practices, Physical Education, or a second language alongside core Science subjects can find their respective SQPs on the same official portal, following the same download process described below.
CBSE Class 12 Exam Pattern 2026-27
Quick answer: The CBSE Class 12 question paper design typically follows a 20:30:50 split — 20% Multiple Choice Questions, 30% competency-based questions (case-based, source-based, assertion-reason), and 50% short and long descriptive answer questions — within a 3-hour offline exam.
| Component | Detail |
|---|---|
| Conducting Body | Central Board of Secondary Education (CBSE) |
| Exam Mode | Offline (pen and paper) |
| Duration | 3 hours per subject |
| Question Types | MCQs, VSA, SA, LA, Case-based/Source-based |
| MCQs | ~20% of total marks |
| Competency-Based Questions | ~30% of total marks |
| Descriptive (Short/Long Answer) | ~50% of total marks |
| Minimum Subjects | 5 (compulsory) + up to 6 (optional) |
| Passing Marks | 33% in theory + practical combined, per subject |
Section-Wise Breakdown (Physics, Chemistry, Biology — Typical Pattern)
| Section | Question Type | No. of Questions | Marks Each | Total |
|---|---|---|---|---|
| A | MCQs | 16–18 | 1 | 16–18 |
| B | Very Short Answer | 5–7 | 2 | 10–14 |
| C | Short Answer | 5–7 | 3 | 15–21 |
| D | Case-Study Based | 2 | 4 | 8 |
| E | Long Answer | 3 | 5 | 15 |
| Total | 70 |
Section-Wise Breakdown (Mathematics — Typical Pattern)
| Section | Question Type | No. of Questions | Marks Each | Total |
|---|---|---|---|---|
| A | MCQs + Assertion-Reason | 18–20 | 1 | 18–20 |
| B | Very Short Answer | 5 | 2 | 10 |
| C | Short Answer | 6 | 3 | 18 |
| D | Long Answer | 4 | 5 | 20 |
| E | Case/Source-Based | 3 | 4 | 12 |
| Total | 80 |
These figures reflect the pattern used in the most recent officially confirmed CBSE sample papers. Exact question counts can shift slightly year to year, so treat the released 2026-27 SQP as the final authority.
CBSE Class 12 Marking Scheme 2026-27: Key Features
Quick answer: The CBSE marking scheme awards marks step-by-step for derivations and numerical problems, gives partial credit for partially correct answers in long-answer questions, and specifies exact keywords or steps examiners should look for — students should study the MS PDF alongside the sample paper, not just the answers.
Key things the official marking scheme tells you:
- The exact wording or steps that earn full versus partial marks in numericals and derivations
- Alternative correct methods that are equally accepted (common in Physics and Maths)
- How case-based and assertion-reason questions are scored when only part of the answer is correct
- Word-limit and diagram expectations for descriptive answers in Biology and Chemistry
Important Changes From the Previous Session
CBSE has, in recent notifications, stated there is no change in the overall assessment scheme from one session to the next when nothing new is announced — meaning the same 20:30:50 pattern, subject weightage, and theory-practical split typically continue. However, students should specifically check the official 2026-27 notification for:
- Any revision to the number of questions per section
- Updated internal choice provisions
- Any change in the syllabus that affects unit-wise weightage
- New question typologies (CBSE has been gradually increasing competency-based and application-based questions each cycle)
Since CBSE issues a formal notification each year confirming or updating the scheme, always verify against that circular rather than relying solely on last year's pattern.
How to Download CBSE Class 12 Science Sample Papers 2026-27 (Official Method)
- Go to the official CBSE Academic website: cbseacademic.nic.in
- Look for the "Sample Question Paper" or "Curriculum" section on the homepage
- Click the link for the current session (typically formatted as SQP_CLASSXII_2026-27)
- Select Class XII, then choose your subject — Physics, Chemistry, Mathematics, or Biology
- Download both the Sample Question Paper (SQP) PDF and the corresponding Marking Scheme (MS) PDF
- Save the files separately by subject for easy access while revising
If the 2026-27 papers haven't been listed yet at the time you check, the portal will still show the most recent available session (e.g., 2025-26), which follows a nearly identical structure and is useful for practice in the meantime.
How to Use Sample Papers for Board Exam Preparation
Downloading the PDF is only step one. Here's how toppers typically use it:
- Simulate real exam conditions. Attempt the full paper in exactly 3 hours, without notes, to build stamina and pacing.
- Grade yourself using the official MS. Don't just check if the final answer matches — check whether you'd have received full step-wise marks.
- Track weak sections separately. Note whether your losses came from MCQs, numericals, or long-answer presentation, and target that specific gap.
- Solve 8–10 papers per subject. Combine the official SQP with a few years of previous sample papers to see recurring question patterns and high-weightage chapters.
- Review answer presentation. In Physics, Chemistry and Maths, examiners award marks for showing correct steps — practising this format matters as much as getting the right answer.
- Revisit after a gap. Re-attempt the same paper a few weeks later to measure actual improvement, not just familiarity.
Frequently Asked Questions
When will CBSE release the Class 12 Science sample papers for 2026-27?
CBSE typically releases sample papers and marking schemes for the new academic session between mid-September and October, ahead of board exams the following February to April. Check cbseacademic.nic.in directly for the exact release date.
Where can I download the official CBSE Class 12 sample papers?
The only official source is the CBSE Academic website, cbseacademic.nic.in, under the Sample Question Paper section. Third-party education websites also host copies, but the CBSE portal is the primary and most reliable source.
Are CBSE sample papers the same as previous year question papers?
No. Sample papers are designed to match the current session's exam pattern and question typology, while previous year question papers contain questions that were actually asked in past board exams. Both are useful, but sample papers should be prioritised for understanding the current pattern.
What is the marking scheme for CBSE Class 12 Physics, Chemistry and Biology in 2026-27?
These subjects generally carry 70 marks for theory and 30 marks for practical exams, with the theory paper split roughly 20% MCQs, 30% competency-based questions, and 50% short/long answer questions, using step-wise marking.
How many sample papers should I solve before the board exam?
Most educators recommend solving 5–10 sample papers per subject after completing the syllabus, focusing on completing each within the actual exam time limit and analysing mistakes afterward.
