American School was the first correspondence school to become regionally accredited. Today we are accredited by the Middle States Association of Colleges and Schools/Commissions on Elementary and Secondary Schools (MSA-CESS), Accreditation International (Ai) and the National Council for Private School Accreditation (NCPSA), as well as recognized by the state of Illinois as a non-public high school. An American School diploma is widely accepted by colleges and universities across the country and around the world. Several thousand high schools use American School to help their students recover credits and graduate on time with their classes. We are proud of our three-way tuition warranty, which ensures customer satisfaction through its ten-day inspection and money-back guarantee, liberal tuition refund policy, and promise of a refund or additional training if you must take a qualifying examination and cannot pass it. Author Christopher Paolini, rising motorsports star Travis Pastrana, tennis legend Andre Agassi and actress Jessica Alba are just some of the famous people who have taken American School courses throughout our 120-year history.