CBSE Class 10 Maths Last-Minute Revision: A 14-Day Plan

Quick answer: With 14 days left, do not re-read NCERT. Spend the time on Algebra, Geometry and Trigonometry, which together carry 47 of the 80 theory marks, plus three full timed papers. Drill past-paper questions, mark them against the official scheme, and re-do only what you actually lost marks on.

I sit IGCSE and A-Levels, not CBSE. What I have is a cousin in Class 10 who let me sit on video calls through her last fortnight, plus a folder of CBSE sample papers and official marking schemes I read line by line out of curiosity about how another system hands out marks. Two things surprised me: how much of the maths paper is decided by presentation rather than ability, and how many students burn their last week on topics that are no longer in the rationalised syllabus. Both are fixable in fourteen days.

Put the 14 days where the marks actually are

The theory paper is 80 marks, with 20 marks of internal assessment already banked. Those 80 marks are split by unit, and the split is nowhere near equal:

• Algebra — 20 marks
• Geometry — 15 marks
• Trigonometry — 12 marks
• Statistics and Probability — 11 marks
• Mensuration — 10 marks
• Number Systems — 6 marks
• Coordinate Geometry — 6 marks

Algebra, Geometry and Trigonometry alone are 47 marks. If you are wobbly in any of the three, that is where your fortnight goes. Number Systems and Coordinate Geometry are 6 marks each. Do not give them three days when Algebra is worth more than three times as much.

The paper runs to 38 questions in five sections: Section A is 20 one-mark questions (18 multiple choice plus 2 assertion-reason), Section B is five 2-markers, Section C is six 3-markers, Section D is four 5-markers, and Section E is three case-based questions worth 4 marks each. Section A plus Section E is 32 marks, 40 percent of the paper, and both reward accuracy more than difficulty.

Three things to stop revising right now

This alone saved my cousin four days.

• The frustum of a cone is not in the rationalised NCERT syllabus. If your notes or an old guide tell you to drill it, they are out of date.
• Constructions were removed too. No compass work is coming.
• Quadratic Equations does not require completing the square. The syllabus asks for solution by factorisation and by the quadratic formula, plus the discriminant and nature of roots. Learn the formula properly instead.

Segment questions in Areas Related to Circles are restricted to central angles of 60, 90 and 120 degrees, so three practised cases cover the lot. Open your current syllabus document and cross out anything no longer listed before you plan a single day.

Days 1 to 14, honestly

Day 1 is an audit, not revision. Sit one past paper cold, three hours, and mark it against the official scheme. It is the most useful thing you do all fortnight, because it tells you which of Algebra, Geometry and Trigonometry is actually weak rather than which one feels weak.

Days 2 to 5: the two weakest of your big three. Per chapter, read only the NCERT summary box, work every solved example with your hand covering the solution, then do previous-year board questions on that chapter and mark them the same day.

Days 6 to 9: Mensuration, Statistics and Probability. The most recoverable 21 marks on the paper, because the methods are mechanical. Mean by assumed-mean and step-deviation, median of grouped data, surface area and volume of combinations of cylinders, cones and hemispheres, probability as fractions in lowest terms.

Days 10 to 12: two more timed papers, one every other day, with the day in between spent only on what you got wrong.

Day 13: one A4 sheet of formulas, handwritten, organised by unit. Writing it is the revision. Day 14: light. Re-read the sheet, redo three questions you know you can do, and sleep.

A worked 5-marker, with the marks shown

Section D is where students lose the most and gain the fastest, because five marks are almost never awarded for the answer alone. A standard heights-and-distances question: the angle of elevation of the top of a tower from a point on the ground is 30 degrees; walking 40 m towards the tower, it becomes 60 degrees. Find the height. Take sqrt(3) = 1.73.

1. Draw and label. Tower AB of height h, foot B, nearer point C, farther point D, with CD = 40 m and BC = x.
2. From the 60-degree triangle: tan 60 = h/x, so sqrt(3) = h/x, giving x = h/sqrt(3).
3. From the 30-degree triangle: tan 30 = h/(x + 40), so 1/sqrt(3) = h/(x + 40), giving x + 40 = sqrt(3)h.
4. Substitute: h/sqrt(3) + 40 = sqrt(3)h. Multiply through by sqrt(3): h + 40 sqrt(3) = 3h, so 2h = 40 sqrt(3) and h = 20 sqrt(3).
5. h = 20 x 1.73 = 34.6 m.

In the schemes I have read, that is roughly one mark for the labelled figure, one for each correct equation, one for solving to h = 20 sqrt(3), and one for the final value with units. So a student who draws the diagram and writes both equations but panics at the algebra still banks three of five. A student who does it all in their head and writes "34.6" gets one. Write every line.

No calculator, so drill the arithmetic

Calculators are not permitted in CBSE board exams. If you have been doing past papers with a calculator on the desk, you have been practising a different exam.

Drill squares to 30, cubes to 12, the exact trig ratios at 0, 30, 45, 60 and 90 degrees, and when to use pi = 22/7 rather than 3.14 (use 22/7 when the radius is a multiple of 7, which it usually is, because it cancels). Keep surds as surds until the last line. Converting sqrt(3) to 1.73 early and then multiplying twice is how rounding errors cost you the accuracy mark.

Ten minutes of mental arithmetic before each session is enough to stop most silly slips. For fresh chapter-specific practice, generate questions in the quiz tool, and check a stuck step in the math solver only after trying it yourself for five minutes.

The five mistakes that cost the most marks

1. Leaving Section A blank. There is no negative marking, so a blank multiple-choice question is a guaranteed zero and a guess is a one-in-four chance.
2. No units. "34.6" is not the same answer as "34.6 m" to a marker.
3. No diagram in geometry and trigonometry questions. Often a mark on its own, and it prevents half of all set-up errors.
4. Rounding mid-calculation instead of at the end.
5. No concluding line. Word problems want "Hence the speed of the train is 40 km/h", not a bare number at the bottom of the page.

Test yourself

1. Which three units carry 47 of the 80 marks, and roughly how much of your remaining time should they get?
2. In a 5-mark heights-and-distances question, name three things that earn marks before you reach the final number.
3. Why should you keep sqrt(3) as a surd until the final line of working?

FAQ

Are calculators allowed in the CBSE Class 10 maths exam?

No. Calculators are not permitted, so every past paper you sit in these two weeks should be done without one. Expect your first no-calculator mock to be slower, and build in the mental-arithmetic drills above.

Is 14 days enough to move from a 60 to an 85?

It is possible if your problem is accuracy rather than missing content. Students who jump that far in a fortnight can usually already do the maths and are losing marks to skipped steps, missing units and blank objective questions. If you have not covered Trigonometry or Mensuration at all, aim for solid rather than spectacular and protect those 47 marks first.

Is the frustum still in the Class 10 syllabus?

No. The frustum of a cone was removed in the rationalised syllabus, along with Constructions, but plenty of older guides still include both. Check your current syllabus document against your revision list on day 1, not day 12.

Standard or Basic maths — does the plan change?

Both papers follow the same design and syllabus and differ in difficulty level, so the plan is identical. If you are sitting Basic, lean slightly harder on Sections A, B and E where the marks are most reachable, and still write full working in Section D.

For fresh full-length practice, build a paper in mock exam; chapter-by-chapter explanations sit in the maths hub.

In short: cut what is no longer examinable, put the fortnight into Algebra, Geometry and Trigonometry, sit three timed papers without a calculator, and write every line of working. Most of the marks between 60 and 85 are not hiding in a chapter you never read — they are sitting in the steps you did not bother to write down.