Cambridge English: Key
Cambridge English: Key is also known as the Key English Test (KET) and Key English Test for Schools (KETfs).
This qualification shows that you can communicate in basic English in everyday situations. It is the first exam in the series of Cambridge English exams for adults
Cambridge English: Preliminary (PET)
Cambridge English: Preliminary is also known as the Preliminary English Test (PET) and Preliminary English Test for Schools (PETfs).
This exam shows that you can communicate in English in practical, everyday situations. It will give you a good foundation if you want to study for a professional English ualification
Cambridge English: Advanced (CAE)
Cambridge English: Advanced is also known as the Cambridge Advanced Certificate in English (CAE).
This general English qualification shows that your English is of a standard expected of a professional business person or an undergraduate university student.
Cambridge English: Proficiency (CPE)
Cambridge English: Proficiency is also known as the Cambridge Certificate of Proficiency in English (CPE).
This qualification shows that you have mastered English and can use it fluently in demanding research, academic and professional situations. This is the highest Cambridge English qualification.