KCSE theory papers officially began on Friday morning with 884263 candidates sitting exams across the country.
The students will start with English paper 1 and later finish the day with Chemistry Paper 1.
Education officials moved across three counties on Friday morning to oversee the opening of containers and distribution of exams.
Teachers service commission CEO Nancy Macharia was in Mombasa county.
Knec CEO David Njengere opened the containers in Wajir and Mandera counties while KICD CEO Charles Ongondo was in Vihiga County.
On Monday next week the Form Four candidates will write Mathematics Paper 1 and English Paper 2.
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