To check exam dates

http://www.britishcouncil.org/italy-exams-milan-ielts-esami-milano.htm

Application form

http://www.britishcouncil.org/italy-exams-ielts-milan-enrol-application-form.pdf

You need to scroll down the webpage to find the table. The main Cambridge qualifications are CPE = Certificate of Proficiency in English, CAE = Certificate in Advanced English, FCE = First Certificate in English. You can also find the table at:

http://www.ielts.org/library/IELTSMainSuiteComparisonsNqfCef-March04.pdf

This is the IELTS calculation of equivalent marks. Other institutions who have drawn up similar tables regarding 'equivalence of marks' do not have exactly the same levels. For example FCE is considered IELTS 6.0 rather than 5.5 by the Italian CRUI. As the above table is from the official IELTS site, and as their table is based on statistical data compiled by the IELTS organisation, I would take the IELTS table as your point of reference rather than other institutions.

http://www.ielts.org/teachersandresearchers/scoreprocessingreportinginterpretation/article231.aspx