While you don’t have to be a member of APMP, economically, it is advisable for you to join the association. If you don’t join, the exam is approximately £180 more expensive for non-members. Individual membership costs approximately £120 per annum (£60 less), so it is more cost effective to join APMP and take the exam, and enjoy the benefits of membership.  Also, you must be a member in good standing to take the Practitioner and Professional certification exams.