CITYSCHOOL has possessed since 1994 the charter of educational institution registered at Mazovian Department of Education and thanks to this is putting out the certificates of Ministry of Education and Science. This obligates CITYSCHOOL to solid and careful marking listeners, otherwise the Institution would lose these authorizations. These certificates are pre-numbered form, with which accompanies appropriate didactic records. These certificates are recognised both in process of the workers' recruitment and by verification of qualification for example in process of team relaxations

According to growing TELC certificates rank CITYSCHOOL became in 2006 licensed Examination Centre. It is the system of examinations created in support of European System of Description Linguistic Education: learning, teaching, estimating Council of Europe. These examinations, from B2 level - intermediate, were contained in Chairman of the Council of Minister’s decree mentioning certificates appropriate to candidates' qualification to work as well as the workers of state administration and the civil service. Essential is the fact, that TELC certificates are recognised on international arena, in many European states. In comparison with different certificates, the examination, where passing an exam authorize to obtain the certificate, puts special emphasis on communicating skill and not on knowledge of grammar.

Moreover since September 2006 CITYSCHOOL got the licence of Centre of Examination's System of Certification equally wide recognised as LCCI (London Chamber of Commerce and Industry) offering considerably wider fan of trade certificates.

CITYSCHOOL leads also courses preparing to examinations carried out by The British Council