School On Air (SOA) is a free teaching project on satellite television produced in Nigeria for Africa. SOA features teaching of major subjects for the Senior Secondary School Certificate Examination for 6 hours a day on the free-to-air satellite television station called Calvary TV. It is aimed at helping over one million candidates that fail the exam yearly. The subjects are taken by seasoned professionals between 10:00am and 1:00pm, rebroadcast from 3:00pm to 6:00pm. Key subjects include English Language, Mathematics, Physics, Chemistry, Biology Agricultural Science, Economics, Government.