As you may know already, Cambridge University, through Cambridge ESOL, delivers a range of language exams. Among them, the most popular are those in the so-called Main Suite: Key English Test (KET), Preliminary English Test (PET), Fisrt Certificate in English (FCE); Certificate in Advanced English (CAE) and the Cambridge Proficiency Exam (CPE). Besides these, there are a couple of rather new developments: Young Learners (YLE) and Teaching Knowledge Test (TKT). There are also the regognised teaching qualifications CELTA and DELTA. Which of these do you already have?
The link below will take you to Cambridge English TV, where you can watch very interesting videos about the exams above. I specially like the one called "Behind the Scenes of Cambridge Exams," where you will see all the preparations and hard work that people back in Cambridge do in order to deliver.
Have a look, you´ll love it!