Core Knowlege (CK) is a collective of former top Year 12 students in South Australia which produces study resources for Year 12 South Australian Certificate of Education (SACE) students. It is the first student collective of its type and magnitude in Australia, recruiting top students from 13 schools across South Australia since 2003. Unlike other similar resources, the Core Knowledge subject guides incorporate a unique student perspective, earning praise from the Australian National Innovation Council in 2005 and students and reviewers from South Australia, Victoria, NSW, Singapore, Malaysia and Indonesia. As of 2007, the resources available include Maths Studies, Biology, Physics and Chemistry subject guides.