Last reviewed: 24 October 2026
Under the old 8-4-4 system, every secondary school student sat the same Mathematics course. Senior school under Competency-Based Education is different. Mathematics is still a core subject for every Grade 10 to 12 learner, but it comes in two forms: Core Mathematics and Essential Mathematics. Which one your child takes depends on the pathway chosen in Grade 9.
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Who Takes Which
According to the Ministry of Education’s Guidelines for Implementation of Senior School Education, every learner takes four core subjects: English, Kiswahili (or Kenyan Sign Language), Community Service Learning and Mathematics. Within Mathematics:
- STEM learners take Core Mathematics.
- Social Sciences and Arts and Sports Science learners take Essential Mathematics.
The pathway subjects, three per learner, are taken on top of these core subjects. Physical Education and ICT are timetabled as support subjects.
Why Two Forms?
STEM fields such as engineering, physics and computing depend heavily on advanced mathematics, so STEM learners need a deeper course. Learners heading into languages, humanities, business, arts or sport still need sound numeracy for daily life, work and further study, which Essential Mathematics is designed to provide. The split lets each learner study Mathematics at a depth that matches their pathway.
What This Means for Pathway Choice
Choosing STEM means committing to three years of Core Mathematics. Before choosing it, look honestly at:
- Your child’s Mathematics results through Grades 7 to 9, and in KJSEA.
- Whether they enjoy problem solving or find Mathematics a constant struggle.
- Their interest in STEM careers, which generally need strong Mathematics.
A learner who loves science but finds Mathematics very hard should talk to teachers before choosing STEM. Equally, a strong Mathematics learner in Social Sciences still benefits from keeping skills sharp.
Does Essential Mathematics Close Doors?
It shapes options rather than closing them completely. Some university and college courses set specific Mathematics requirements, and those rules for the CBE cohort will be published by the relevant bodies over time. If your child is undecided between STEM and another pathway, ask the school’s career guidance teacher what each choice would mean for the courses they are interested in.
How to Prepare Over the Holiday
- Keep practising Grade 9 topics two or three times a week.
- Focus on the basics that every course builds on: fractions, ratios, algebra and geometry.
- Encourage your child to explain their working aloud, which builds understanding.
- Use mistakes as learning points rather than reasons for worry.
Linking to KJSEA Results
KJSEA reports Mathematics on the eight-point scale from EE1 to BE2. A result in the Meeting or Exceeding Expectation range is a good sign for Core Mathematics. Use our KJSEA grade calculator to understand the levels, and read the STEM pathway guide.
Related Guides
See choosing a senior school pathway, the Social Sciences pathway and the Arts and Sports Science pathway.
Mathematics Practice
The daily countdown gives five free questions a day. Full Mathematics papers for Grades 4 to 9 with worked answers come with the Monthly Pass (KSh 500) or the Year Pass (KSh 4,000), paid by M-Pesa.