What is the best way to revise for an IB Psychology HL/SL exams?

Do not revise everything that has been given to you. This is a waste of time. Revise all 8 mark and 22 mark questions from either the biological, cognitive or socio-cultural pack. Revise 8 mark questions from the remaining two. Then revise any other 22 mark questions from the remaining packs that you find easy to learn or easy to write about. Take a similar approach to your optional pack accordingly. To revise - look at the questions that will come up and make essay plans. Do not revise studies, theories individually.