 "Professional Certificate in Education" is the title used for qualifications at bachelor's degree level.The "Certificate of Postgraduate Studies" (CPGS, also called "Certificate in Postgraduate Studies" or "Certificate in Postgraduate Study") is a postgraduate certificate offered by a variety of British universities.It is typically taken as the first year exam of a PhD-course and aims at making sure that the student has learnt the necessary knowledge for successfully working on their PhD.