CET Delhi Polytechnic 2026 Important Maths Chapters by Weightage

For CET Delhi Polytechnic 2026 Mathematics, Algebra, Trigonometry and Mensuration carry the highest weightage in previous year papers and must be your first focus for last-minute revision before the June 28 exam.

CET Delhi Polytechnic 2026 is scheduled for June 28, 2026. The Mathematics syllabus covers Class 9 and Class 10 CBSE topics. The exam carries 360 total marks across 90 questions; each correct answer awards 4 marks and each wrong answer deducts 1 mark. Strategic revision targeting high-weightage chapters helps you score more while reducing risk from negative marking.

• Total marks: 360 (90 questions at 4 marks each) with a -1 penalty per wrong answer, as confirmed in the official Information Bulletin 2025-26.
• Algebra chapters (Quadratic Equations, Linear Equations, Arithmetic Progressions and Polynomials) account for an estimated 30-35% of Math questions based on previous year paper analysis.
• Trigonometry and Mensuration each contribute approximately 10-12% of Math questions and are the next highest-priority areas after Algebra.
• Statistics and Probability together offer direct, formula-based questions that are ideal for last-minute score gains.
• The full syllabus is based on CBSE Class 9 and Class 10; no topics beyond Class 10 board level appear in the paper.

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CET Delhi Polytechnic 2026 Mathematics Exam Overview

The CET Delhi Polytechnic 2026 paper follows an objective-type pattern with 90 questions and 360 total marks. Each question carries 4 marks and each wrong answer results in a -1 mark deduction. The paper is bilingual in English and Hindi and must be completed within 90 minutes. Mathematics is the core section and draws exclusively from the CBSE Class 9 and Class 10 curriculum.

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Chapter-wise Weightage for CET Delhi Polytechnic 2026 Maths

The table below shows the approximate chapter-wise weightage for the Mathematics section based on analysis of previous year CET Delhi Polytechnic papers. Use this to prioritise your revision before the June 28 exam.

Approximate weightage based on previous year CET Delhi Polytechnic paper analysis. Actual distribution may vary.

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Top High-Weightage Chapters: Key Topics to Revise

Focus your last-minute revision on these specific concepts within each high-weightage chapter. Since the exam carries a -1 penalty per wrong answer, revise only topics you can answer with confidence.

Quadratic Equations

• Standard form: ax² + bx + c = 0
• Quadratic formula: x = (-b ± √(b² - 4ac)) / 2a
• Discriminant (D = b² - 4ac): D greater than 0 gives two distinct real roots; D = 0 gives equal roots; D less than 0 gives no real roots
• Factorisation method and word problems based on area, time-distance and age

Trigonometry

• Six ratios: sin, cos, tan, cosec, sec and cot and their interrelationships
• Standard angle values for 0°, 30°, 45°, 60° and 90°
• Identity 1: sin²θ + cos²θ = 1; Identity 2: 1 + tan²θ = sec²θ; Identity 3: 1 + cot²θ = cosec²θ
• Complementary angles: sin(90° - θ) = cosθ; tan(90° - θ) = cotθ
• Identity simplification is the most common question type in this chapter

Surface Areas and Volumes (Mensuration)

• Formulae for sphere, hemisphere, cylinder, cone, cuboid and cube: commit all six to memory before the exam
• Combination of solids such as a cone placed on a hemisphere is the highest-frequency question type
• Frustum of a cone: Volume = (πh/3)(r₁² + r₂² + r₁r₂); Curved Surface Area = π(r₁ + r₂)l
• Conversion problems: one solid shape melted and recast into another

Linear Equations in Two Variables

• Consistency: a₁/a₂ ≠ b₁/b₂ gives a unique solution; a₁/a₂ = b₁/b₂ = c₁/c₂ gives infinite solutions; a₁/a₂ = b₁/b₂ ≠ c₁/c₂ gives no solution
• Elimination and substitution methods are key: expect at least one word-problem type in the paper

Arithmetic Progressions

• nth term formula: aₙ = a + (n - 1)d
• Sum of n terms: Sₙ = n/2 × [2a + (n - 1)d] or Sₙ = n/2 × (a + l)
• Problems asking you to find n, a or d from two given conditions about the sequence

Triangles

• Basic Proportionality Theorem: if DE is parallel to BC then AD/DB = AE/EC
• Similarity criteria: AA, SAS and SSS
• Ratio of areas of similar triangles equals the square of the ratio of their corresponding sides
• Pythagoras Theorem and its converse

Statistics

• Mean by direct method, assumed mean method and step-deviation method
• Median formula from grouped data: M = l + [(n/2 - cf) / f] × h
• Mode formula: l + [(f₁ - f₀) / (2f₁ - f₀ - f₂)] × h

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Last-Minute Revision Strategy for CET Delhi Polytechnic 2026

• Negative marking is present: do not guess blindly. Only mark an answer if you have narrowed it to two options or are reasonably confident; skipping is safer than a random guess.
• Solve at least two previous year CET Delhi Polytechnic papers in timed conditions to build speed for 90 questions in 90 minutes.
• Prepare a one-page formula sheet for Trigonometry (identities and standard angle values) and Mensuration (surface area and volume for all six shapes). Revise it each morning until exam day.
• In Statistics, identify whether the question asks for mean, median or mode before applying any formula as each uses a separate table and calculation method.
• For Quadratic Equations, check the discriminant first to decide whether to factorise or apply the quadratic formula directly.
• Prioritise Very High chapters first (Quadratic Equations, Trigonometry and Mensuration) then High chapters; leave Moderate chapters for the final day of review.
• Revise Probability last as classical probability (favourable outcomes divided by total outcomes) is simple and can be fully covered in a single session.

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