A smaller number of candidates pushed up marginalised and arid counties in national KCSE ranking, helping them to trounce economic giants like Nairobi, Kiambu, Kajiado and Nyeri. According to the Kenya National Examinations Council, Samburu was the best performing county. However, a closer analysis reveals that it neither has any candidate in the top 100 nationally nor any top-ranked school. Siaya, Elgeyo Marakwet, West Pokot and Trans Nzoia completed the list of best-performing counties. But it is all a numbers game. Because counties are ranked on the average performance of all its students, regions with fewer candidates got an advantage over the more populous — and prosperous — ones. Eight of the top 10 counties registered less than 10,000 candidates, numbers that could have helped them to tilt the scales upwards even without a sterling performance from individual students. The counties are ranked based on averages of performance index of all their candidates....
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