 Very few offer the American system of education and a good number of them offer the Kenya system.Some of the oldest private schools in Kenya include Loreto Convent Msongari, Nairobi (1921), St. Mary's School, Nairobi, Braeburn School, Consolata School, Strathmore School, Oshwal Academy, Rift Valley Academy, Aga Khan Academy, Kenton College and Brookhouse School,

The average grade is based on performance in the eight subjects.Where a candidate sits for more than eight subjects, the average grade is based on the best eight subjects.