How to write answers in the board exam for full marks

To write a CBSE Class 10 board answer for full marks, write every step the marking scheme pays for. In the Maths scheme, each written answer is split into steps worth half a mark or one mark. The working, the reason and the final answer are each a place where a mark is earned.

How are CBSE Class 10 answers marked?

They are marked against a marking scheme - a list of the steps each answer should show, and the marks for each one. CBSE puts out a sample paper and its scheme every year. For 2026-27, practise with the Maths Standard sample paper and its marking scheme.

The examiner can only give a mark for what is on the page. A step done in your head earns nothing, because nobody can see it. That is why marks go missing even when the answer was known.

This way of marking is called step marking - marks given for each correct step, not just the final answer. How step marking splits an answer into marks shows the idea in full.

How long should answers be for 2, 3 and 5 mark questions?

Let the marks tell you how many steps to show, not how many words to write. The 2026-27 Maths and Science sample papers set no word limit. The marking scheme shows what each mark is for.

• A 2-mark answer. Question 24 asks for the area of a sector with a 28 cm diameter and a 22 cm arc. The scheme gives half a mark for the radius, 14 cm. It gives 1 mark for the formula with the numbers put in. The answer, 154 cm², earns the last half mark. How an examiner marks one real answer walks through the same sector question.
• A 3-mark answer. Question 28(A) has four marked steps, shown in the picture below. One of them is a reason written in words.
• A 5-mark answer. Question 32, about a swimming pool in a park, has seven marked steps. They are worth half a mark or one mark each. One whole mark is for throwing out the answer that cannot be true.
• A 5-mark Science answer. In the 2026-27 Science marking scheme, Question 39(A) has three short parts worth 1 mark each. The diagram of the lens is worth the other 2 marks.

What does a full-marks answer look like?

Take Question 28(A) from the Maths Standard sample paper. A polygon's smallest outside angle is 8°. Each next angle is 4° more. How many sides does it have?

The scheme gives 1 mark for setting up the equation. The outside angles of any polygon add up to 360°, and here they form a list that grows by the same step each time. The next mark is for solving the equation. Then half a mark is for writing both answers, -15 and 12.

The last half mark is for one short sentence. An angle is always positive, so n is 12. A student who writes only "12 sides" has left that reason off the page.

Do you need to write reasons in Maths answers?

Yes, when the answer rests on a rule. In geometry, the scheme can pay for the reason written beside a step.

Question 29 asks you to prove that a parallelogram drawn around a circle is a rhombus. Its first mark goes to four equal pairs of lengths. The scheme prints the reason beside them: tangents drawn from one outside point to a circle are equal.

Theorems work the same way. For the 5-mark theorem in Question 33, 1 mark is for the figure, what is given, what is to be proved, and the construction. That mark comes before a single line of proof.

How should you present your answer sheet in the CBSE board exam?

Neat pages do not earn marks on their own. They help the examiner find every step that does.

• Number each answer as the paper does. Keep parts (i), (ii) and (iii) apart. In a case study, each part has its own marks.
• Answer only one option in a choice question. The Science paper says a student "is expected to attempt only one of the alternatives".
• Draw figures with care. The Maths paper asks you to "draw neat and clean figures wherever required". In Science, a diagram can carry marks of its own.
• Write each Science answer in its own section of the answer book. For the 2026 exam, CBSE split the Science answer book into three sections: Biology, Chemistry and Physics. Its circular of 9 December 2025 says an answer written in the wrong section "will not be evaluated". Check your year's instructions.
• Keep your name off the answer book. It is treated as unfair means. Why examiners must not know whose answer book it is explains the rule.

How do you write answers for ICSE Class 10?

The idea is the same: show the working. CISCE, the board that runs ICSE, gives this advice in its report on the 2025 ICSE Maths paper. It lists suggestions for students.

• Show all working. Steps and rough work go "on the same page where the question is answered".
• Give reasons in geometry. Name the theorem or property each step uses.
• Round off only at the end. The report says rounding is done "only at the final stage".
• Skip working for multiple choice. The report asks students not to show it.

ICSE answers are written in blue or black ink, with pencil only for diagrams. For Physics numericals, how ICSE step marks work for formula, working and unit goes into detail.

Topper answer sheet, Class 10: should you study one?

Yes, but next to the marking scheme, not instead of it. CBSE puts real answer books from its board exams on its website, on a page called Model Answer by Candidate. People call each one a CBSE topper answer sheet, though CBSE does not use the word topper.

When we checked on 1 October 2026, the page had Class 10 answer books for 2023, 2024 and 2025. Each year covers Maths Standard, Maths Basic, Science, Social Science, English, Hindi A and Hindi B.

A topper answer sheet shows what a strong answer looks like on the page. You can see how the steps are laid out, where a diagram sits and how short a 1-mark answer can be. But it is one student's way of writing. The scheme shows every step that earns a mark, for every student.

So read the scheme the way an examiner does. What a marking scheme contains explains its parts, including value points - the separate facts a Science answer must name to earn its marks.

One way to use both: write your own answer to a past question - the Class 10 papers we cover are a place to start. Check it against the marking scheme first, then look at how the answer book set out the same question.

How can you practise writing answers this way?

• Write out full answers, then mark them yourself. Put your answer next to the scheme. Tick each step you wrote. Circle each step you skipped.
• Look for the half marks. The reason, the unit and the answer you throw out are small. Each can still be half a mark.
• Practise against the clock. Writing every step takes time. How to plan the three hours of the paper works out a time budget from the paper's own marks.
• Do the same for Science. Where the marks go in CBSE Science covers diagrams, equations and numericals.

No way of writing can promise a mark. But an answer with every step on the page gives the examiner something to mark at each one. What the marking scheme rewards across a whole paper takes the same idea further.

About the author

Deepti Sardana

Founder Member & Academic Lead

An IIT alumna (M.Sc., M.Phil.) with over 25 years in teaching, child psychology and learning assessment. As Academic Lead at EduBrahma, she leads the method TRUtesting uses to find where and why a child loses marks.

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