That is not a question any one person can answer but you. It all depends on your strengths and weaknesses and your career path. If you want to work as a statutory auditor you might have to take P7. If you are within the EU, then P6 might be a requirement for certain functions. If you are currently in a financial role, or your background is in finance, then you might find P4 very manageable, likewise if you are a cost accountant, you might find P5 to be up your alley.