Exam Writing Tips
Subject-specific strategies for writing answers in the CBSE Class 10 exam. Time planning, answer format, diagram rules, and the most common ways marks are lost — for each subject.
Science
3 hours · 80 marks · ~2 min/mark
Class 10 Science covers Physics, Chemistry, and Biology in one paper. The 2025-26 paper has 5 sections: 1M MCQs (Section A), 2M short (Section B), 3M short (Section C), 4M case-based (Section D), and 5M long answers (Section E). Diagrams, balanced equations, and case-based answers are where most marks are won or lost.
Time Planning
First 15 minutes: plan, don't write
Mark questions you can answer quickly. Identify long-answer questions you're confident about.
25–30 minutes for all MCQs
Don't spend more than 1 minute per MCQ. Mark uncertain ones and return.
3–5 minutes per question
Keep answers tight. 2 marks = 2 points. Don't write paragraphs.
8–10 minutes per case
Read the passage or data fully before answering sub-questions. Answers must refer back to the given scenario — don't write generic theory.
12–15 minutes per long answer
Diagrams first, then explanation. Budget time before you start.
Answer Writing Strategy
Always draw before explaining
In Life Processes, Control & Coordination, Light — start with the diagram. A correct labelled diagram earns half the marks even if explanation is incomplete.
Begin definitions with 'It is defined as...' or 'It refers to...'
Don't begin with 'This is when...'. A clear definitional opening ensures you get the definition mark.
Write balanced equations with conditions
Show conditions (heat, catalyst) above/below the arrow. Unbalanced equations lose the equation mark.
Use a two-column table for comparison questions
3 marks = 3 rows of differences. Tabular format is clearer and faster to mark.
Write formula → substitute → solve
Every numerical: write the formula first, then substitute with units, then compute. Never jump straight to the answer.
State sign convention for optics numericals
Write 'Using New Cartesian sign convention' before solving. All distances must have sign.
Common Mistakes to Avoid
Never leave a diagram unlabelled
A beautifully drawn diagram without labels scores 0 marks. Always label, even if the drawing is rough.
Always write units with every numerical answer
Answers without units lose ½ mark. Focal length: cm or m; Resistance: Ω; Power: W.
Write one clear sentence, not just one word
A 1-mark question expects a complete sentence: 'The function of the nephron is to filter blood and form urine.' Not just 'filtration'.
List steps in correct sequence
For respiration, digestion, photosynthesis — sequence matters. Wrong order = partial credit only.
Quick Wins
In Life Processes and Light, diagrams alone earn half the marks
Nephron, eye, brain (parts), ray diagrams for mirror/lens — a correctly labelled diagram earns the diagram mark even if your written explanation is thin. Draw it first, every time.
Ch 1 and Ch 2 reactions: equation + conditions = 2M in under 2 minutes
Write the balanced equation with conditions (heat, catalyst, light) above/below the arrow. This pattern earns 2 marks reliably across Chemical Reactions and Acids/Bases/Salts questions.
Every Science numerical follows the same 3-step structure
Step 1: write the formula. Step 2: substitute values with units. Step 3: compute and write answer with unit. Master this pattern and numerical marks become predictable — the formula and substitution steps alone are usually worth 2 of 3 marks.
Mathematics
3 hours · 80 marks · ~2 min/mark
Maths is the highest-scoring subject in Class 10 — 100/100 is genuinely achievable. Marks are given for method, not just answers. Show every step.
Time Planning
30–35 minutes for all objective questions
Don't get stuck on an MCQ. If you can't solve it in 90 seconds, mark and move on. Return at the end.
4–5 minutes each
Two marks = two clear steps or one proof step + answer. Show method.
7–8 minutes each
These often need proofs or multi-step constructions. Plan before you start writing.
8–10 minutes per case
Read the passage carefully. Connect back to the given context in each answer.
Answer Writing Strategy
Write the formula before substituting
For every numerical: first write the formula used (area of circle = πr²), then substitute, then calculate. This earns the method mark even if the final answer is wrong.
Write LHS = ... = ... = RHS
Start from one side only (usually the more complex side). Show each algebraic step clearly.
Use pencil, ruler, compass — no freehand
All geometric constructions must be done with instruments. Freehand will not earn full marks.
Use prime factorization — show every step
Write the full prime factorization of each number. HCF = product of smallest powers of common factors; LCM = product of greatest powers of all factors. Show both factorizations clearly before computing.
Define variables explicitly before forming equations
Write 'Let the number be x' or 'Let the speed of the train be x km/h'. Setting up the equation correctly earns marks even if you solve it wrong.
Common Mistakes to Avoid
Substitute every variable clearly in Median and Mode formulas
For Median = l + [(n/2 − cf)/f] × h, write l, n, cf, f, h with their values before computing. Same for Mode. Partial credit requires visible substitution.
Always simplify probability fractions
P(E) = 6/36 must be written as 1/6. An unsimplified fraction loses ½ mark.
Memorise standard angle table — don't derive in exam
You lose 2–3 minutes deriving values you should know by heart. Memorise sin/cos/tan for 0°, 30°, 45°, 60°, 90°.
Be careful with negative coordinates
Section formula and distance formula errors almost always involve wrong signs. Write coordinates with brackets: (x₁, y₁) = (−2, 3).
Quick Wins
State the theorem before the proof — that's a free step mark
For BPT, Pythagoras, tangent-radius proofs — write the theorem statement first ('By Basic Proportionality Theorem:'), then prove it. The theorem statement is worth 1 mark on its own.
If factorisation takes more than 30 seconds, switch to the formula
Quadratic formula always works. If you can't spot factors immediately, don't waste 3 minutes — use x = [−b ± √(b²−4ac)] / 2a and show each substitution step clearly.
sin²θ + cos²θ = 1 has three useful forms — know all three
sin²θ = 1 − cos²θ; cos²θ = 1 − sin²θ; 1 + tan²θ = sec²θ; 1 + cot²θ = cosec²θ. Most trig proof questions require one of these — spotting which form fits is the entire skill.
English Language & Literature
3 hours · 80 marks · ~2 min/mark
Class 10 English has Reading (20M), Writing & Grammar (20M), and Literature (40M). Writing section and grammar are the most predictable — practice these for free marks. Literature requires textual knowledge.
Time Planning
40–45 minutes for both passages
Read questions first, then the passage. Scan for keywords instead of re-reading.
40–45 minutes
Format marks are free. Know the format of notice, letter, and paragraph perfectly.
75–80 minutes
Reference to context: 2–3 minutes each. Long answers: 15 minutes each. Plan answers before writing.
Answer Writing Strategy
Answer in your own words — paraphrase, don't copy
Copying the passage verbatim may not score marks. Rephrase using the question's vocabulary.
Format marks are the easiest marks
Notice: Heading (NOTICE), Issuing authority, Date, Subject, Body, Name/Designation. These are guaranteed marks if memorised.
Open with a topic sentence that answers the question directly
Don't begin with 'In this story...' or 'The author wrote...'. Begin by directly answering: 'Bholi overcame her fear of rejection by...'
Three parts: speaker, situation, significance
Who says/does this? What is happening at this point in the poem/story? Why is this moment important?
Common Mistakes to Avoid
Stay within word limits
Notice: ~50 words. Letter: ~150 words. Paragraph: ~100–120 words. Going over wastes time and can reduce score.
Tense consistency in answers
When writing about a story/poem, use present tense: 'Bholi feels...', not 'Bholi felt...'
Back every point with a quote or reference
Never make a claim without supporting it: 'Bholi is brave, as seen when she refuses to marry the lame miser.'
Quick Wins
Memorise notice and letter formats exactly — those marks are guaranteed
Notice: NOTICE heading (centred, underlined) → issuing authority → date → subject → body → Name/Designation. Formal letter: sender address → date → receiver address → subject → salutation → body → closing. Format marks don't require good writing — just accurate structure.
For editing/omission questions, identify the error type before correcting
Common error types: subject-verb agreement, tense consistency, article (a/an/the), preposition. Identify what's wrong before writing the correction — random changes often introduce new errors.
Three-part structure earns full marks on reference-to-context
Every extract/reference-to-context answer needs: (1) who is speaking or what this is from, (2) what is happening at this moment in the text, (3) why it is significant. Write these as three short sentences — you don't need long paragraphs.