Kosoiywo Senior School (formerly called Kosoiywo Secondary School) is a C4 Public Mixed Senior School that is physically located in Nandi County, Nandi East Sub County  in the Rift Valley Region of the  Republic of Kenya. This article provides all the details about Kosoiywo Senior School, including: the school’s cluster, level, UIC Code, Knec Code, Admissions and location.

This Day Senior School forms part of the Nandi Education Network and has fully transitioned to a Senior School that offers Competency Based Education (CBE) Curriculum to Grade 10, 11 and 12 Learners.

Kosoiywo Senior School School’s Basic Data and National Information.

School’s Old Name	Kosoiywo Secondary School
School’s New Name	Kosoiywo Senior School
Cluster	C4
Gender	Mixed
Accomodation Type	Day
Region	Rift Valley
County	Nandi
Sub County	Nandi East
UIC Code	CCLN
KNEC Code	29541211
Type of School	Public
Regular or SNE	Regular
Disability Type	None

Kosoiywo Senior School operates as a fully Senior School offering the Competency Based Education (CBE/CBC) Curriculum. Students transition to this school from Junior School after sitting for the Kenya Junior School Education Assessment (KJSEA); which is a national assessment for Grade 9 learners under the Competency-Based Curriculum (CBC/ CBE). It assesses students in nine learning areas to evaluate their readiness to transition into Senior School.

Students who join Kosoiywo Senior School at grade 10 specialize in any one of the following three main CBE pathways:

1. STEM (Science, Technology, Engineering, and Mathematics): Focuses on innovators and problem-solvers. It branches into Pure Sciences, Applied Sciences, and Technical Studies, leading to careers like medicine, engineering, and IT. 
2. Social Sciences: Designed for communicators and leaders. It includes tracks in Languages, Literature, Humanities, and Business Studies, preparing students for fields like law, journalism, and education. 
3. Arts & Sports Science: For creative minds and athletes. It features tracks in Visual Arts, Performing Arts, Music, and various sports disciplines, fostering careers in the creative and sports industries.

Kosoiywo Senior School’s Background and History.

Kosoiywo Senior School, historically known as Kosoiywo Secondary School, has played a very key role in the Kenyan Education Sector and more particularly in Nandi county; where it is domiciled.

The school has grown over the years and is now a fully recognized  C4 Public Senior School. In January 2026, Kosoiywo Senior School admitted the first grade 10 learners under the CBE Curriculum.

Location of Kosoiywo Senior School.

Kosoiywo Senior School’s exact physical location is in Nandi County, Nandi East in the Rift Valley Region of the  Republic of Kenya.

What to know about Rift Valley Region’s Senior Schools.

Rift Valley is the home of some of the best and highly competitive Senior Schools in Kenya. Kosoiywo Senior School, just like other Senior schools in the region, favourably compete in co-curricular activities, academics and Infrastructural development. Before joining  Kosoiywo Senior School, confirm the pathways it offers.

Frequently Asked Questions About Kosoiywo Senior School.

1. What is the UIC Code for Kosoiywo Senior School?

The UIC Code for Kosoiywo Senior School is CCLN.

2. Is Kosoiywo Senior School a Boarding or Day School?

Kosoiywo Senior School is a Day Senior School.

3. What CBE Grades are taught at Kosoiywo Senior School?

Kosoiywo Senior School offers CBE Senior Schools Grades at Grade 10, 11 and 12.

4. What is the Knec Code for Kosoiywo Senior School?

The Official Knec Code for Kosoiywo Senior School is 29541211.

5. In Which County is Kosoiywo Senior School Found?

Kosoiywo Senior School is located in Nandi County.

6. Does Kosoiywo Senior School admit Boys, Girls or Both?

Kosoiywo Senior School is a Mixed Senior School.

7. What was Kosoiywo Senior School’s Fomer Name under the 8-4-4 Education System?

Kosoiywo Senior School was formerly called Kosoiywo Secondary School.

8. What is Kosoiywo Senior School’s New Cluster?

Kosoiywo Senior School is now classified as a C4 Senior School.

9. Is there SNE Support for Learners at Kosoiywo Senior School?

Kosoiywo Senior School offers support for Regular learners. The school’s Disability Type is None.

10. Where is Kosoiywo Senior School Located?

Kosoiywo Senior School is found in Nandi East Subcounty of Nandi County; in the Rift Valley Region of the Republic of Kenya.

11. Is a Kosoiywo Senior School Private or Public School?

Kosoiywo Senior School is a Public School.

12. What CBE Pathways are offered at Senior School?

Senior schools offere 3 pathways; STEM, Social Sciences and Arts and Sports.