Raila's statement comes a day before the start of the national examinations.
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Odinga wished the over one million pupils sitting for the national exams all the best of luck.
"Today, over 1 million boys and girls will begin the final process of sitting the KCPE exams that mark the end of their years in primary school and transition to high school.
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I take this opportunity to wish these young boys and girls the best of luck and success in the exams. I encourage all candidates to be courageous as they prepare to sit the exams. It is a major transition that sees them progressively taking over their own future and ours as a country," Odinga said.
The NASA leader encouraged the candidates advising them that they the only way to realise lasting success was only through hard work and playing by the rules and urged them to avoid the temptations of shortcuts.
On Monday, the over one million pupils will be taken through rehearsals before the start of the examinations on Tuesday morning with Mathematics and English before the Composition paper in the afternoon.
Candidates will be examined in Science, Kiswahili Lugha and Insha on Wednesday before finishing with Social Studies and Religious Education papers on Thursday.
KCSE is expected to begin on November 6 and end on November 29 while the rehearsals for will be on November 3.
A total of 1,003,556 candidates will sit for this year's KCPE while KCSE will have a total of 615,773 candidates.
The examinations will be conducted in 28,566 examination centres for the KCPE and 9,350 for KCSE.