The results of the 2012 Kenya Certificate of Primary Education examinations were released on Monday, placing three students at the top with 430 marks each.
The top three are a female student Kinoti Kathure from Meru, Mwaura Boniface and Wachira Njomo both from Kiambu County.
Education minister Mutula Kilonzo while releasing the results said 88 people, including candidates and teachers had been arrested and charged over exam irregularities.
"County Directors of Education are urged to ensure non-tolerance of cheating," he emphasised.
He however said that strict laws enacted during his tenure at the ministry had led to a massive drop in cheating.
He also said there was marked improvement in the exams.
"There was overall improved performance which means children can do well without extra tuition, which remains banned."
The top five school nationally are; Newlight Academy in Komarock followed by Makini School on Ngong Road, and Gilgil Academy in third position. Friend's Academy in Meru followed and Pleasant View School in Kiambu came in at position five.
In county ranking, Kirinyaga County came in tops with a mean score 273 followed at number two by Elgeyo Marakwet with a mean score of 272 as Nandi County came third with a score of 271.