Grade five pupils on Tuesday started their Kenya National Examinations Council assessment tests across the country.
The students on Tuesday morning sat for their mathematics paper.
The Kenya National Examinations Council portal was opened for schools to download the tests on Saturday.
Knec posted assessment tools to the Competency-Based Assessment portal which will be accessible from January 31 to February 4.
The exam body directed school heads to upload the assessment results to the portal by February 21.
On Monday, the Grades 3 and 5 assessments that were scheduled to be administered on Monday did not start.
A spot check by the Star revealed most of the schools were yet to administer the exams.
Schools with many students and unreliable internet experienced challenges downloading the tests.
Grade 3 learners were assessed in integrated areas from October to December last year.
This year, the end-of-grade assessment will be based on Mathematics and English activities.