Most Important Chapters — Class 12 Mathematics
Class 12 Maths is 80 marks. Calculus alone is ~35 — nearly half the paper.
TL;DR: Class 12 Maths is 80 marks. Calculus alone is ~35 — nearly half the paper.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Class 12 Maths is 80 marks. Calculus alone is ~35 — nearly half the paper.
Class 12 Mathematics — Unit-wise Marks Weightage
CBSE Board — 80 marks in theory, listed heaviest first so you can see where your revision time actually earns marks.
| Unit | Marks | Share | What to focus on |
|---|---|---|---|
| Calculus | 35 | 44% | Continuity, derivatives, integrals, differential equations — practise daily. |
| Vectors & 3-D Geometry | 14 | 18% | Dot/cross product, lines and planes — formula-driven. |
| Algebra (Matrices & Determinants) | 10 | 13% | Operations, inverse, solving equations — accuracy matters. |
| Relations & Functions | 8 | 10% | Types of functions, inverse trig. |
| Probability | 8 | 10% | Conditional probability, Bayes’ theorem. |
| Linear Programming | 5 | 6% | Graphical method — easy full marks. |
How to Use This Weightage
Work down the table rather than through the textbook in order. Calculus and Vectors & 3-D Geometry alone account for 49 of 80 marks, so a week spent there moves your score further than a week spent on the last three units combined. Once the heavy units are secure, the lighter ones are usually short and formula-driven, which makes them efficient to finish last.
Treat the tips in the final column as the specific sub-topics examiners return to. They are where the marks in each unit actually sit.
Frequently Asked Questions
Which chapters carry the most marks in Class 12 Mathematics?
Calculus (35 marks) and Vectors & 3-D Geometry (14 marks) carry the most — 49 of 80 between them. Securing these two before anything else is the single highest-return decision in your revision plan.
What is the total marks for Class 12 Mathematics?
CBSE Board carries 80 marks in theory. The unit-wise split above accounts for all of them.
Should I skip the low-weightage units?
No. The smallest units here are worth 5 marks, which is more than the gap between most grade boundaries, and they are usually the quickest to prepare. Order your revision by weightage; do not delete anything from it.