Private Basic and Secondary schools and also private higher education institutions do exist in Portugal and are sometimes elite institutions (like the Universidade Católica Portuguesa in Lisbon and Porto, or some private primary, basic and secondary schools, mainly located in the biggest cities), existing among them many religious or speciality institutions. Many of the best ranked secondary schools in the country are private schools, as well as some of the worst ranked secondary schools. This secondary schools ranking has been released every year in Portugal, and is based on the student's average grades in the National Examinations which are used for higher education admission.