Class 8 is the year CBSE changes gear, and most families notice it in October, when the first unit test in maths comes back twenty marks lower than Class 7's. The child has not got weaker; the subject has changed. Arithmetic has become algebra, and science has split into the topics Class 9 and 10 assume you know. Online tuition for Class 8 CBSE works when it treats the year that way: as the foundation of the board years, taught a term ahead, chapter by chapter from NCERT. This post lists the maths and science chapters, the ones that decide Class 9 and 10, where children fall behind, the school-term timetable, and how a 1-on-1 class keeps a child ahead.
Class 8 maths: the chapters, and which ones decide Class 9 and 10
NCERT Class 8 Mathematics, in the order most schools teach it:
| Chapter | What it is | Weight for Class 9 and 10 |
|---|---|---|
| Rational numbers | Fractions and negatives together; properties; the number line | High: number systems in Class 9 assume it |
| Linear equations in one variable | Solving with variables on both sides; word problems | Very high: Class 9 and 10 linear equations, and every word problem after |
| Understanding quadrilaterals; practical geometry | Polygons, angle sums, constructions | Medium |
| Data handling | Bar and pie charts, grouped data, probability | Medium: Class 9 and 10 statistics |
| Squares and square roots; cubes and cube roots | Patterns, estimation, the long-division method | High: surds and Pythagoras later |
| Comparing quantities | Percentages, profit and loss, discount, simple and compound interest | Very high: appears in every later class and every competitive exam |
| Algebraic expressions and identities | Multiplying expressions; the three identities | Very high: Class 9 polynomials are this chapter continued |
| Mensuration | Area of trapezium and polygon, surface area and volume of cuboid, cube, cylinder | High: Class 9 and 10 surface areas and volumes |
| Exponents and powers | Laws of exponents, negative exponents, standard form | Very high: used everywhere from Class 9 |
| Direct and inverse proportions | Ratio in tables and word problems | Medium |
| Factorisation | Common factors, identities, division of expressions | Very high: Class 9 polynomials, Class 10 quadratics |
| Introduction to graphs | Coordinates, line graphs | Medium: Class 9 coordinate geometry |
Seven of the twelve are "very high" or "high". A child who leaves Class 8 without linear equations, identities, factorisation and exponents will struggle in Class 9 whatever else they know.
Class 8 science: the chapters that Class 9 assumes
Force and pressure and friction (Class 9 motion and force), sound (Class 9 sound), light (reflection, the eye; Class 10 light), chemical effects of electric current (Class 10 electricity), cells and reproduction in animals (Class 9 cell and tissues, Class 10 reproduction), microorganisms, synthetic fibres and plastics, metals and non-metals (Class 10 metals), coal and petroleum, combustion, and the environmental chapters. The diagrams (the eye, the cell, the electrolysis setup) and the definitions are what the exam tests, and the same diagrams come back in Class 9 and 10.
Where Class 8 children fall behind
- The sign rules. Rational numbers and linear equations both fail on −(−3) and on moving a term across the equals sign. Two classes fix it if it is done in September; two months if it is left to the annual exam.
- Identities memorised, not used. (a + b)² = a² + 2ab + b² is chanted and then not recognised in 103². Identities are taught as tools for calculation and factorisation, or they are useless.
- Percentages as a formula. Profit, loss, discount and interest each get a formula; the child who understands "per hundred" needs none of them and gets all of them right.
- Science learned as text. The chapters are learned by reading; the exam asks for diagrams, differences and reasons. Every class should end with one diagram drawn from memory and one "why".
- The pace. Forty-five in the class and a chapter a fortnight; a child who misses one week of exponents has missed exponents.
The timetable, and the term-ahead plan
Most CBSE schools run April to March with a half-yearly exam in September or October and the annual exam in February or March; the Gulf CBSE schools follow the same calendar. The plan that works: from April, two 1-on-1 classes a week (maths and science, or both maths if maths is the concern), each teaching the chapter the school will start the following week, so the school class becomes revision. From August, past unit tests; from January, full annual-exam papers under time, marked to the CBSE pattern. A child who starts in October after a bad unit test catches up over the winter with three classes a week until the half-yearly gaps are closed, then two.
Online or a local tutor
For Class 8, a 1-on-1 online class on a shared whiteboard is at least as effective as a home tutor: the algebra is done on the board, the diagrams are drawn and redrawn, the recording is re-watched before the test, and the same tutor teaches all year. It is worse than a home tutor only for a child who will not sit at a screen, which by Class 8 is rare. In India home tutors for Class 8 charge ₹500 to ₹1,000 an hour and coaching centres ₹2,000 to ₹5,000 a month for groups; in Dubai AED 60 to 150 an hour; ours is US$10 to $13 an hour, 1-on-1, on the pricing page.
What we do
Our CBSE Class 6, 7 and 8 maths and science classes teach NCERT chapter by chapter, a week ahead of the school, one tutor with one child, in English, Hindi or Punjabi, for families in India, the Gulf and the nine countries where Indian children attend CBSE schools or keep CBSE alongside a local system. The first 30-minute class is free; send the school's chapter plan and the last unit test.
Questions parents ask
1Is Class 8 CBSE difficult?
2Which Class 8 maths chapters matter most for Class 9 and 10?
3How many hours of online tuition does a Class 8 student need?
4What does online tuition for Class 8 CBSE cost?
See how we teach this, 1-on-1 online →
Shobha
Founder and lead tutor, Science with Shobha
Teaching maths, science and English to children online since 2018. 500+ students, 20+ tutors, families in nine countries.