California Group of Schools began as a modest vision: to provide accessible, high-quality education rooted in strong moral and spiritual foundations. What started with a single institution has since grown into a thriving academic network serving over 1000 learners across four distinct schools.

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California International School Shines in May/June 2025

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Sheikh Mohamed Halike

🌟 Youth & Good Morals — Building

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A Day of Pride and Promise: Graduation

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KCSE Mean Score Journey: 3.7 (2020) → 8.8 (2023) 2020

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Weekly CATs + National Contests = Consistent Excellence

100% University Placement 2020

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Medicine • Engineering • Business • Nursing Alumni.

Where Faith meets Academic Rigor 2018

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8-4-4 Curriculum + Islamic Values + Leadership Development.

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img ABOUT US

Stive for Excellence

California Secondary School operates under the esteemed umbrella of the California Group of Schools, grounded in academic excellence, moral integrity, and spiritual growth. With a structured curriculum, a disciplined learning environment, and a team of dedicated educators, we nurture hardworking, respectful, and service-driven students—empowering them to make meaningful contributions within their communities and beyond.

  • Curriculum: Kenyan 8-4-4 System
  • KCSE Preparation: Termly opener/mid-term/end-term exams, Weekly topical CATs, National Math/English/Science contests, Certificate-awarded trivia competitions.
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Our Mission

To empower students to become responsible, confident, and future-ready individuals through holistic education grounded in academic rigor and Islamic values.

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Our Vision

To be Nairobi's premier secondary institution where: Every student achieves academic mastery through Kenya's 8-4-4 curriculum Islamic values integrate seamlessly with modern education.

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7 +

Years of Academic Excellence

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Where Futures Are Forged

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🏆 CBE Accreditation Achieved

Officially registered as a Senior School under Kenya's Competency-Based Education framework, becoming a pioneer in the CGOS network.

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🔬 Dual-Pathway Innovation

Launching specialized STEM (Advanced Sciences/Engineering) and Social Sciences (Economics/Business/Political Science) tracks for Grade 10 starting January 2026.

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🚀 Industry-Aligned Curriculum

Blending 8-4-4 rigor with future-focused competencies: Digital portfolios, STEM industry certifications, & Social enterprise projects.

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🎓 Early Enrollment Advantage

Applications now open for January 2026 intake with: Pathway selection counseling, KNEC-partnered assessments, & University credit opportunities.

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School Principal

Joel Oenga Endosa

(+254) 725 89 0079

Mon - Sat : 07am - 05pm

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Solution that inspire progress

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Proven Academic Transformation

3.7 to 8.8 in 3 years. Not luck—just systems, grind, and smart growth. We don’t wait for success. We build it.

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Future-Focused Pathway Innovation

Pioneering CBE in Nairobi—2026 brings STEM & Social Science specializations, digital portfolios, and university credit. It’s not just school. It’s a launchpad.

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Values-Infused Holistic Development

Faith. Discipline. Excellence. 100% university placement since 2020—because values shape futures.

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Personalized Success Engineering

Mentorship. Mapping. Measurable results. 78% of our grads get hired in under 6 months. From hospitals to startups—they’re building the future.

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img Recent Milestones

Check our latest Achievements

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OSSD

🎓✨ A Day of Pride and Promise! ✨🎓

A Day of Pride and Promise: Kisomo International Collegiate Graduation in Partnership with California Group of Schools

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CGOS

✅ Celebrating 2024 KCSE, KCPE, KEPSEA & IGCSE Champions

The energy was electric at the CGOS's Hall on February 10th, 2024, as the school came together to celebrate the academic stars of 2023.

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Hear from our school community.

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Best School

"When we transferred Ali to CSS in 2023, his KCSE prediction was 6.2. Within one year, his mid-term average jumped to 8.1! The weekly CATs and personalized mentoring made this transformation possible. But what truly sets CSS apart is how they blend academic rigor with Islamic discipline - Ali now leads Friday prayers at our local mosque."

Ahmed Hassan

Father of Form 3 Student
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Best School

"CSS's 'Strive for Excellence' ethos became my professional mantra. Despite the pandemic year (mean 3.7), the teachers' relentless support helped me score A- in Biology and Chemistry. Their career guidance program secured my Kenyatta University medicine slot. Today, I'm the first doctor from California Estate - proof that CSS turns obstacles into opportunities."

Dr. Amina Mohamed

Medical Resident
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Best School!

"Being part of CSS's first CBE cohort changed everything. Our solar-powered irrigation project won the 2025 Science Congress, and guess what? KNEC counted it towards my Physics grade! The teachers don't just lecture - Principal Endosa himself mentors our STEM club every Thursday. Next year, I'm applying to MIT with 60 university credits already earned."

Fatima Abdullahi

Form 4 STEM Track
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Best School!

"We've hired 7 CSS graduates since 2022 - their technical skills and ethical grounding are unmatched. Their CBE digital portfolios showcase real competencies, not just grades. Our company now sponsors the school's innovation lab because CSS doesn't produce graduates; they develop solution-driven leaders who transform communities."

ng. Wanjiku Mwangi

Director Kenya Engineering Solutions
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Frequently Asked Questions

Our systematic approach delivers unmatched growth: Period; - 2020-2023 | CSS Improvement; - +138% (3.7→8.8) | Nairobi Average;- +22% |. Weekly CATs and national contest participation, Personalized remediation programs, & 2024 Goal: Break 9.0 barrier with new STEM labs

We offer Nairobi's only dual-pathway program with: 8 Industry certifications (Cisco/AWS for STEM; KAM/KNCCI for Social Sciences), University credit options (60+ hours for STEM, 45+ for Social Sciences), & Real-world projects (78% address community challenges)

Our faith-integrated approach drives tangible results: Daily Values Practice → Improved Discipline → +37% Focus/Metrics → Higher Academic Performance. *100% university acceptance since 2020*

CSS's industry-aligned programs deliver: 78% employment rate within 6 months of graduation, 4x more certifications than national average, & Startup incubation for 15% STEM / 25% Social Sciences students.

Our streamlined 2026 intake pathway: 1. 📝 Application: 1 Mar-30 Aug 2025 (Online portal) 2. 🧠 Assessment: 15-30 Sept 2025 (STEM/Social Sciences aptitude tests) 3. 🗣 Interview: Oct 2025 (Pathway counseling session) 4. ✅ Enrollment: Nov 2025 (Early bird fee discount)

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Our team is ready to guide you through every step. Reach out anytime.

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NEWS & ARTICLES

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19 JUL
2025
cgos Academic Excellence

Celebrating Excellence: 2024 CGOS National Exam Champions

Celebrate the CGOS Graduation 2025 — a day of faith, achievement, and lifelong learning. Discover the highlights, speeches, and proud moments.

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26 JUL
2025
cgos Academic Excellence

🎓✨ PP2 Graduation Ceremony Highlights – California Integrated Academy ✨🎓

Celebrate the PP2 graduation at California Integrated Academy, California Group of Schools. See the joy, performances, and proud moments as our youngest learners move to Grade 1.

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02 AUG
2025
cgos Academic Excellence

A Day of Pride and Promise: Graduation 2025

Celebrate the Class of 2025 at California Group of Schools! Relive the joy, Qur’an recitations, heartfelt speeches, and unforgettable graduation moments from our July 27th ceremony at the CGS Conference Hall.

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Need More Info? Just Ask.

Our team is ready to guide you through every step. Reach out anytime.

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Nairobi

California Square, Timboroa Street – Eastleigh

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