24 hours to exam? This page tells you exactly what to focus on, what to skip, and how to manage your time tomorrow.
CBSE Class 10 Mathematics
24 Hours Before the Exam
No time for everything. This guide tells you exactly what to revise, which topics almost certainly appear, what mistakes to avoid, and how to manage your 3 hours in the exam hall.
Focus on These Chapters First
- Trigonometry — all identities and heights & distances approach
- Surface Area & Volume — formulas for all solids + combined solid method
- Statistics — mean by step-deviation, median from ogive
- Quadratic Equations — factorisation + quadratic formula
- Arithmetic Progressions — nth term and sum of n terms
- Real Numbers — HCF/LCM using Euclid's lemma, irrationality proof
- Circles — tangent theorems and their applications
- Triangles — BPT theorem statement, similarity criteria
Key Formulas & Facts to Memorise Right Now
- sin²θ + cos²θ = 1 | 1 + tan²θ = sec²θ | 1 + cot²θ = cosec²θ
- Distance formula: √[(x₂-x₁)² + (y₂-y₁)²]
- Section formula: [(mx₂+nx₁)/(m+n), (my₂+ny₁)/(m+n)]
- Area of triangle with coordinates: ½|x₁(y₂-y₃)+x₂(y₃-y₁)+x₃(y₁-y₂)|
- Quadratic formula: x = [-b ± √(b²-4ac)] / 2a
- Volume of sphere = 4/3πr³ | Cone = 1/3πr²h | Cylinder = πr²h
- Curved surface area: Sphere = 4πr² | Cone = πrl | Cylinder = 2πrh
- Mean (step deviation): x̄ = a + h × (Σfᵢuᵢ/Σfᵢ)
- P(A) = number of favourable outcomes / total outcomes | P(A) + P(Ā) = 1
Timing Strategy for 3 hours Exam
- 1First 15 minutes: Read the full paper. Mark easy questions with a tick
- 20–40 min: Section A (MCQs and assertion-reason) — 1 mark each, do not overthink
- 340–90 min: Section B & C (2-mark and 3-mark questions) — attempt all
- 490–150 min: Section D (5-mark questions) — attempt familiar ones first
- 5150–170 min: Case study questions — read carefully, use diagrams
- 6Last 10 min: Review and fill in anything skipped. Check units and final answers
Common Mistakes — Avoid These Tomorrow
- ✕Not writing units (cm², m³) in geometry and mensuration answers
- ✕Forgetting to verify the answer in quadratic equations
- ✕Using degree instead of radian (or vice versa) in trig problems
- ✕Not showing all steps — even if the answer is correct, marks are given for working
- ✕Skipping the rough work for statistics — always show the frequency table
- ✕Writing HCF instead of LCM or vice versa in word problems
- ✕Not rationalizing the denominator when asked to simplify surds
Must Attempt — Never Leave These Blank
- ✓All MCQs and assertion-reason (Section A) — no negative marking, always guess
- ✓Statistics question — mean and median are straightforward if you follow steps
- ✓Probability question — usually simple and gives easy marks
- ✓Coordinate geometry — distance/section formula are direct formula substitutions
Skip If Unsure (Return If Time Permits)
- →Complex proof-based 5-mark questions if you're unsure of the approach
- →Heights & distances if you're confused — attempt simpler 5-mark questions first
Remember: Partial marks exist. Attempt and leave if stuck — come back if time allows. Never spend more than 8 minutes on a single 5-mark question.
Maths is the most predictable CBSE paper — the same types of questions appear every year. If you've practised the chapters listed above, you already know 70% of what's in the paper.
Night Before — Non-Academic Checklist
Pack your bag
Admit card, 2 pens, pencil, eraser, ruler, geometry box (if needed)
Sleep by 10 PM
Your brain consolidates memory during sleep. Late-night cramming hurts more than it helps
Stop studying at 9 PM
Whatever you don't know by tonight won't be learnt in an hour. Trust your preparation
Set two alarms
One to wake up, one as a backup. Arrive at the centre 30 minutes before the exam
More resources for Class 10 Mathematics
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