CBSE Class 10 + 12 board exam pattern 2027: subject-wise 3-hour papers, no negative marking

Every CBSE 2027 board paper is a 3-hour pen-and-paper subject test with five sections (MCQ + VSA + SA + LA + Case-based) and no negative marking. Class 10 papers are 80 + 20 marks; Class 12 papers are 70 + 30 (Sciences) or 80 + 20 (everything else).

CBSE board exams are subject-wise - you sit one 3-hour paper per subject across several weeks. There is no single big combined paper. Each paper covers one subject, has a mix of MCQ + short answer + long answer + case-based questions, and no negative marking. Class 10 papers are typically 80 marks theory + 20 internal assessment = 100. Class 12 papers vary by subject (70 + 30 for Sciences / 80 + 20 for Math, English, Commerce, Humanities).

What is the Class 10 (SSE) subject set?

CBSE Class 10 requires 5 main subjects + 1 optional. Each subject is a 3-hour paper:

Class 12 (SSCE) - by stream

Class 12 students take 5 subjects per stream. English is compulsory across all streams.

Science (PCM / PCB)

Commerce

English Core (80+20) · Accountancy (80+20) · Business Studies (80+20) · Economics (80+20) · 5th: Mathematics / Applied Math / Informatics Practices / Phys Ed (varies).

Humanities

English Core (80+20) + 4 humanities subjects from History, Political Science, Geography, Sociology, Psychology, Economics, Phys Ed, Painting (each typically 80+20).

What is the theory vs internal assessment split?

Every CBSE subject paper carries 100 marks, split between a board-conducted theory paper and a school-conducted internal assessment. The exact split varies by subject and class. Theory carries the bulk of the weight in Class 10 (80 marks) and varies in Class 12 (70 or 80 marks). Internal assessment includes periodic written tests, subject enrichment activities, portfolio work, and (for Sciences) practical experiments. Internal marks are evaluated by the school and submitted to CBSE before the board paper.

For Class 12 Science subjects with a practical component (Physics, Chemistry, Biology, Computer Science), the 30 marks include a written experiment (~20 marks) and a viva voce + practical file (~10 marks). For Class 10 and non-Science Class 12, the 20 internal marks usually break down into 10 marks for periodic tests, 5 marks for subject enrichment activity, and 5 marks for portfolio / project work, though the exact split varies by subject.

What is the question pattern per paper?

Every CBSE paper since 2022-23 follows a five-section structure (exact counts vary by subject):

Internal choices exist in most long-answer questions (you pick one of two options). MCQs in Section A do not have internal choices. Practice both the option-A and option-B side of each LA so you can pick whichever you're stronger on during the real paper.

Ready to test where you stand? Take a free CBSE Class 10 mock in this exact section blueprint and see your indicative grade in 30 minutes.

What are assertion-reason and competency-based questions?

Two of the question types CBSE has been steadily expanding since 2022-23 are assertion-reason and competency-based questions. Both sit inside Section A and Section E primarily, but their flavour shows up across the paper.

Assertion-reason questions give you two statements - an assertion and a reason - and ask which is true and whether the reason correctly explains the assertion. The four standard options are: (a) both true and reason explains the assertion, (b) both true but reason does not explain, (c) assertion true reason false, (d) assertion false. These questions reward careful NCERT-line reading and rule out vague half-knowledge. Practice 5-10 of these per chapter in the run-up to the boards.

Competency-based questions test application of a concept to an unseen scenario. In Mathematics this looks like a real-world word problem; in Sciences it is often a lab data set or graph to interpret; in Social Science a source-based passage with multiple sub-questions; in Languages an unseen comprehension or analytical writing prompt. The competency-based share is around 50% in Class 10 and around 40% in Class 12 from the 2026 cycle onwards. Treat these as the primary calibration target rather than direct-recall questions.

What is the attempt strategy per section?

The best section-by-section strategy depends on your subject mix and confidence per section, but a general framework works for most students:

• Read first, attempt second. Use the 15 minutes of reading time to scan every question, mark MCQs you are confident on, flag the long-answer options you will pick, and pre-decide your section order. Do not start writing until the reading time ends.
• Anchor on Section A. The MCQ + Assertion-Reason section is the highest-density score per minute when you know the content. Aim to close it inside 30-35 minutes with full attempts. Skip nothing - no negative marking.
• Don't skip case-based. Section E case-based questions tend to look intimidating because of the passage length, but the sub-questions inside are often easier than the passage suggests. Attempt all of them - the marks per minute are favourable.
• Pick option in Section D early. Most long-answer questions have an internal choice (Option A or Option B). Pick during the reading time and commit. Mid-question switching wastes 10-15 minutes.
• Reserve 20-25 minutes for review. Even if you feel time pressure, leave the last 20-25 minutes for review and partial attempts on skipped questions. CBSE awards step marks generously, so a partial answer is much better than a blank.

Scoring & passing

• No negative marking on any CBSE paper. Attempt every question - the worst case is a 0, never a deduction.
• 33% to pass in each subject (both theory and internal aggregated). Less than 33% in any subject = compartment exam in July.
• Class 10 grading: CBSE awards grades (A1, A2, B1, B2, C1, C2, D, E1, E2) based on 9-band percentile distribution within the board. Raw marks are also reported on the marksheet.
• Class 12 marks: raw marks + percentile reported on the marksheet. There is no grading band in Class 12.
• Best of 5 (Class 12):for college admission percentage, most universities use your best 4 subjects (English + 3 others) for the "Best of 4" aggregate, sometimes Best of 5.

Class 12 student aiming at a CUET-feeder aggregate? Take a free CBSE Class 12 mock and see your projected Best-of-4 aggregate in 30 minutes.

Why a step-marks mindset matters

CBSE checkers award step marks generously across most subjects - especially in Mathematics, Sciences, and Accountancy. That means partial working can earn 40-60% of a question's marks even when the final answer is wrong. Two practical consequences: do not skip questions you partially know, and write working clearly enough that a checker can follow your logic step by step.

How should you split 3 hours per paper?

CBSE gives 15 minutes of additional reading time at the start (you can read the question paper but not write). Use it. A workable split for a typical paper:

• 15 min:reading time - read every question, mark long answers you're confident on
• 35 min: Section A MCQs + Section B VSA - finish the recall-heavy stuff fast
• 55 min: Section C Short Answer - highest-density section by question count
• 50 min: Section D Long Answer + E Case-based - depth + step-marks here
• 25 min: review + answer-sheet check, especially OMR-style sections

The cleanest way to internalise the time split is to sit a timed paper. Take a free CBSE Class 10 mock in real-exam mode and see where your minutes actually go.

Subject-wise format quirks to know

The five-section blueprint is consistent across CBSE subjects, but each subject has small quirks worth knowing in advance:

• English (Class 10 + 12): Section A is the reading-comprehension and grammar section (unseen passage + factual / inferential questions). Section B is writing skills (letter, article, story). Section C is the literature section based on the prescribed textbook. Plan 45 minutes for reading-comprehension because the passage is long.
• Mathematics (Class 10 Standard / Basic and Class 12): Section A is the MCQ + Assertion-Reason block. Section B-D scale up in question length. Section E includes one or two case-based questions with real-world context. Carry an extra pen - rough work happens on the answer booklet itself.
• Science (Class 10): integrated Physics + Chemistry + Biology paper. Each sub-area gets roughly equal weight. Internal choices exist in long-answer questions across all three sub-areas. The paper rewards balanced prep - a single weak sub-area drops the overall score sharply.
• Physics (Class 12): 70-mark theory + 30-mark practical. The theory paper is denser in numerical problems than Class 10 Science. Section A includes a derivations block; Section E case-based questions often involve circuit diagrams or graph interpretation.
• Chemistry (Class 12): 70 + 30. Organic Chemistry typically holds the largest single-topic share inside the theory paper. The Sample Paper marking scheme is the right calibration tool here because the question style is unusually specific to NCERT phrasing.
• Biology (Class 12): 70 + 30, recall-heavy with NCERT diagrams and labelling questions. The paper closely mirrors NEET style in many sections, so NEET aspirants gain natural cross-prep.
• Accountancy + Business Studies (Class 12): 80 + 20. Long-answer questions in Accountancy are largely account-format problems; clear, well-laid working is the norm. Business Studies rewards crisp definitions and bulleted answer structure.
• Social Science (Class 10) / Humanities subjects (Class 12): heavy reading load, including source-based passages. The case-based section is dense - practise reading the passage twice before attempting questions.

How the CBSE marking scheme is actually applied

CBSE checkers work from a per-subject marking scheme document released by cbseacademic.nic.in alongside the sample paper each September. The marking scheme breaks every question into model answer points with a defined mark per point. This means a 5-mark long-answer question is rarely all-or-nothing - it is typically a 5-step breakdown where each step is independently scored, and partial answers earn proportional marks. Two practical consequences for the candidate: write answers in numbered or bulleted steps where the question structure allows, and show working in problem-style questions (Maths, Physics, Chemistry, Accountancy) rather than only the final answer. Even a wrong final answer with the right working can pick up 60 - 70% of the marks.

For MCQ and assertion-reason sections, the marking is strictly binary - full mark for the correct option, zero for incorrect or blank. With no negative marking, the dominant strategy is to attempt every MCQ even on partial knowledge. For case-based questions in Section E, the sub-questions are independently scored, so a candidate who finds the passage difficult should still attempt the straightforward 1-mark and 2-mark sub-questions rather than skipping the whole block.

Practice the exact format