The CBSE Class 12 Maths board exam is 80 marks over 3 hours. Unlike other subjects, Maths has no memory component — every mark requires solving a problem correctly. This makes chapter prioritisation critical: some chapters appear with 10–15 marks every single year.
Official CBSE Chapter-Wise Marks Distribution 2026
| Unit | Chapters | Marks | Priority |
|---|---|---|---|
| Unit 3: Calculus | Integration, Diff. Equations, Applications of Derivatives | 35 marks | ★★★ Highest |
| Unit 4: Vectors & 3D Geometry | Vectors, 3D Geometry | 14 marks | ★★★ Must do |
| Unit 1: Relations & Functions | Relations, Functions, Inverse Trig | 8 marks | ★★ High |
| Unit 2: Algebra | Matrices, Determinants | 10 marks | ★★★ Must do |
| Unit 6: Probability | Probability | 8 marks | ★★★ Must do |
| Unit 5: Linear Programming | Linear Programming | 5 marks | ★★ Medium |
Tip
Calculus alone is 35 out of 80 marks — almost half the paper. If you master Integration (definite and indefinite), Applications of Derivatives, and Differential Equations, you have secured 35 marks before touching any other unit.
The 5 Most Repeated Question Types in Class 12 Maths
- 1.Definite integrals using properties (∫₀^π, ∫₀^(π/2)) — appears 9/10 years as a 4–5 mark question
- 2.Matrices: finding inverse using cofactors or elementary row operations — 5 marks, 9/10 years
- 3.Probability: Bayes' Theorem or conditional probability problems — 5 marks, 9/10 years
- 4.3D Geometry: line and plane equations, angle between them — 4–5 marks, 8/10 years
- 5.Application of Derivatives: maxima-minima word problems — 5 marks, 8/10 years
Integration — The Chapter That Makes or Breaks Your Score
Integration appears in nearly every question in the Calculus unit. CBSE tests it through:
- Indefinite integration using substitution, parts (ILATE rule), partial fractions
- Definite integrals — especially using the property ∫₀^a f(x)dx = ∫₀^a f(a-x)dx
- Area under curves using definite integration (application question, 5 marks)
- Differential equations — variable separable, homogeneous, linear types
Matrices & Determinants — Guaranteed 10 Marks
This unit has the most predictable questions in Class 12 Maths:
- Finding matrix inverse using adjoint method or elementary operations
- Solving system of equations using matrices (3 equations, 3 unknowns)
- Properties of determinants — evaluating using row/column operations
- Applications: area of triangle using determinants
3-Week Study Plan for Class 12 Maths (July 2026 Exam)
| Days | Topic | Daily Practice |
|---|---|---|
| Day 1–5 | Integration — all types, definite integrals, area | 15–20 problems/day |
| Day 6–8 | Matrices & Determinants — inverse, equations system | 10 problems/day |
| Day 9–11 | Probability — Bayes, conditional, independent events | 10 problems/day |
| Day 12–14 | 3D Geometry — lines, planes, angles, distances | 8 problems/day |
| Day 15–17 | Application of Derivatives — rate of change, maxima-minima | 8 problems/day |
| Day 18–20 | Vectors, Relations & Functions, Linear Programming | 5–8 problems/day |
| Day 21 | Full mock test — 80 marks in 3 hours | 1 full paper |
For Class 12 Maths, practice is non-negotiable. Reading theory alone will not translate to marks. Every chapter should be studied by solving 10–20 problems per type, not by reading solutions passively.