Introduction to CBSE Notes

The Central Board of Secondary Education (CBSE) is a national-level board of education in India for public and private schools, controlled and managed by the Union Government of India. It is one of the largest education boards in the world, with over 27,000 affiliated schools across India and in more than 20 countries.

CBSE conducts two major board examinations:

• Class 10 — All India Secondary School Examination (AISSE)
• Class 12 — All India Senior School Certificate Examination (AISSCE)

The Class 10 result determines whether a student progresses to the senior secondary level (Classes 11-12), while the Class 12 result is used for university admissions across India and is widely accepted by international institutions.

Students study a common curriculum across six core subjects. The Class 10 board exam is the first nationally-standardised examination a CBSE student sits.

Students choose a stream (Science, Commerce, or Humanities) and study specialised subjects. The Class 12 board exam is the final school-leaving examination and the primary criterion for undergraduate admissions in India.

These notes cover the following subjects across Classes 9-12:

The board examination is conducted at the end of Class 10. Each subject paper is in most cases 3 hours long and carries 80 marks. The remaining 20 marks are awarded through internal assessment components.

For Science stream subjects (Physics, Chemistry, Biology), the practical component includes laboratory experiments and record books. For Computer Science, practicals include programming exercises and project demonstrations.

CBSE board exam papers follow a structured format:

• Objective type questions (MCQs, fill-in-the-blanks, assertion-reasoning): ~20%
• Short answer questions (2-3 marks each): ~30%
• Long answer questions (5 marks each): ~30%
• Case-study / source-based questions (introduced 2020 onwards): ~20%

Questions are designed to test understanding and application rather than rote memorisation. Internal choices are provided within some questions.

CBSE uses a nine-point grading scale:

A student must obtain a minimum of Grade D (33% in each subject) to pass.

Class 12 results are reported as subject-wise marks (out of 100) along with an overall percentage. No grading scale is used — marks are absolute. The passing mark is 33% per subject (27 out of 80 in the board exam plus qualifying internal assessment).

CBSE publishes detailed marking schemes for every board exam paper. Key points:

• Step-marking is followed — partial credit is awarded for correct intermediate steps in numerical and derivational questions.
• Diagrams carry separate marks where applicable.
• Value-based questions (testing moral/ethical awareness) carry 3-5 marks per paper.
• There is no negative marking for incorrect answers.

The Mathematics syllabus progresses from foundational algebra and geometry in Classes 9-10 to calculus, linear programming, and probability in Class 12. Key emphasis areas include:

• Class 9-10: Number systems, polynomials, coordinate geometry, trigonometry introduction, statistics, probability
• Class 11: Sets, relations, functions, mathematical induction, complex numbers, sequences and series, straight lines, conic sections, limits and derivatives
• Class 12: Relations and functions, inverse trigonometry, matrices and determinants, continuity and differentiability, applications of derivatives, integrals, differential equations, vectors, three-dimensional geometry, linear programming, probability

Physics is offered from Class 11 onwards in the Science stream. The Class 11 syllabus covers mechanics and thermal physics, while Class 12 focuses on electromagnetism, optics, and modern physics.

Chemistry in Class 11 covers basic concepts, atomic structure, chemical bonding, thermodynamics, and equilibrium. Class 12 covers electrochemistry, organic chemistry (alcohols, aldehydes, ketones, carboxylic acids, amines), and polymers.

Biology in Class 11 covers cell biology, plant physiology, and human physiology. Class 12 covers genetics and evolution, biotechnology, ecology, and reproduction.

Computer Science (subject code 083) is offered in Classes 11 and 12. The syllabus includes programming in Python or C++, computational thinking, data structures (arrays, stacks, queues), databases and SQL, and networking concepts.

English (Core, subject code 301) covers reading comprehension, advanced writing skills (letters, articles, speeches, reports), grammar, and prescribed literature from the NCERT textbooks Flamingo and Vistas (Class 12) or First Flight and Footprints without Feet (Class 10).

1. Follow NCERT textbooks — CBSE board exams are based almost entirely on NCERT content. Read every chapter thoroughly, including in-text questions, exercises, and summaries.
2. Solve previous year papers — Practising the last 5-10 years” board exam papers is the single most effective preparation strategy. CBSE papers follow predictable patterns.
3. Use the marking scheme — CBSE’s official marking schemes show exactly how marks are allocated. Practise writing answers in the format expected by examiners.
4. Focus on concepts, not rote learning — While memorisation of formulas and definitions is necessary, CBSE increasingly tests conceptual understanding and application.
5. Practise numerical problems regularly — For Mathematics, Physics, and Chemistry, daily practice of numerical problems builds speed and accuracy.
6. Write clear and structured answers — Long-answer questions benefit from headings, subheadings, bullet points, and diagrams. Examiners appreciate well-organised responses.
7. Manage time in the exam — Allocate time proportionally to marks. A 5-mark question should receive roughly 5-6 minutes of writing time.

These notes are part of the broader Wyatt’s Notes qualification revision library. You may also find the following useful:

• ISC — The Indian School Certificate, an alternative to CBSE offered by CISCE-affiliated schools
• GCSE — UK qualification covering similar subjects at a comparable level
• AP — US Advanced Placement courses for university-level content
• SAT — US standardised test for undergraduate admissions

CBSE notes are actively being developed. Mathematics notes for Classes 9-12 are being expanded first, with Science and Computer Science content following. Check back regularly for new material or contribute on GitHub.

The key principles covered in this topic are linked in the sub-pages above. Focus on understanding the definitions, applying the formulas or frameworks, and evaluating strengths and limitations of each approach.

Worked examples demonstrating the application of key concepts are covered in the detailed sub-pages linked above.

• Confusing terminology or concepts that appear similar but have distinct meanings.
• Overlooking key assumptions or boundary conditions that limit applicability.