The process will begin on December 3, she disclosed.
Amina noted that unlike in past years where a second selection was done, the process would be completed once in early December.
Speaking at Star of the Sea Primary School, Amina remained confident that all the pupils would be able to transition to high school.
50 percent of the candidates scored over 250 marks in the exam that saw a boy and a girl tie for the top spot.
Rawlings Odhiambo of Kakamega Hills Academy and Olive Mwea of Riara School both scored 453 marks.
CS Amina noted that the overall performance had improved, with female candidates performing better than males in English, Kiswahili and Kenya sign language.
Female candidates, on the other hand, performed better in Mathematics, Science, Social studies and religious studies.
Amina maintained that none of the nine papers administered during the 2018 KCPE exam were leaked.
12,273 candidates scored more than 400 marks in this year's exams.
CS Amina noted that this represented a 1.17 per cent increase from the 9,846 in 2017.
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