Last reviewed: 24 October 2026
The CBC Challenge for Grade 9 is a free ten-question quiz in Mathematics, English and Integrated Science. Every question is matched to a strand in the junior school curriculum design, and you get your score, the topics you missed and a short explanation for each answer the moment you finish. Used properly, it is one of the quickest ways to find out what a Grade 9 learner still needs to revise before KJSEA. This guide explains how to get real value from it instead of just chasing a high score.
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What the Grade 9 Challenge covers
Each round pulls ten questions at random from a bank for the subject you pick. In Mathematics the bank covers indices and logarithms, cubes and cube roots, linear inequalities, the equation of a straight line, similarity and enlargement, trigonometry, volume and density, money (VAT, import duty, currency conversion, interest and commission), bearings, probability and basic algebra such as factorising and solving equations. English questions test grammar, vocabulary in context, comprehension and functional writing conventions. Integrated Science covers the Grade 7–9 strands, from mixtures and acids to the human body and simple electricity.
Because the questions are drawn at random, two attempts are rarely the same. That is deliberate: a learner who takes the quiz three times over a week sees a wider spread of topics than one who takes it once.
A simple weekly routine
- Monday: diagnose. Take one Mathematics round without notes or a calculator unless the question needs one. Do not look anything up. The point is an honest picture.
- Tuesday and Wednesday: fix. Write down every topic listed under “revise these”. Open the matching notes on the Grade 9 hub and work five practice questions on each topic from a past paper or the textbook.
- Thursday: second subject. Repeat the diagnose step for English or Integrated Science.
- Friday: retest. Take the Mathematics round again. If the same topic shows up as wrong, it needs more time; if it is now right, move on.
Fifteen minutes a day is enough. Short, regular practice works better than a long session on Sunday night.
Read the explanations, not just the score
Every answer comes with a one or two line explanation. Learners who skip these lose most of the benefit. Ask your child to read the explanation aloud for any question they got wrong and then say, in their own words, what they will do differently next time. For a Mathematics question on VAT, for example, that might be “I forgot to add the 16% to the original price; I only found the tax”.
Common mistakes we see in Grade 9 answers
- Indices: multiplying the powers instead of adding them when the bases are the same.
- Straight lines: mixing up the gradient and the y-intercept in y = mx + c.
- Inequalities: forgetting to reverse the sign when dividing by a negative number.
- Money: calculating the tax but not the final price, or using the wrong exchange direction when converting shillings to dollars.
- English: choosing a word that “sounds right” without checking the tense of the whole sentence.
How this fits with KJSEA preparation
The Challenge is a diagnostic tool, not a full exam. Once it shows you the weak topics, move to longer practice with Grade 9 revision papers, which have full-length questions and marking schemes. Check the KJSEA timetable so the last weeks are spent on subjects in the order they will be written, and use the KJSEA grade calculator to see what a score means on the eight-level scale.
A note for parents
Keep the tone light. The Challenge shows a percentile so learners can see how they compare, but a low score early in the term is useful information, not a failure. Praise the retest improvement more than the first score. Our questions are written by the CBC Guides team and checked by a teacher; we are an independent revision site and not part of KNEC or KICD.