IB Psychology looks at behaviour and mental processes through three approaches: biological, cognitive and sociocultural. Each one asks a different kind of question. The biological approach looks at how the body and brain relate to behaviour. The cognitive approach looks at how people think, remember and make sense of the world. The sociocultural approach asks how other people, groups and culture shape what we do. Seeing how these approaches differ, and where they overlap, gives you a framework for the whole course.
Assessment combines exam papers with an internal research report. That means you need two kinds of skill: writing under timed conditions, and planning and reporting a small piece of research of your own.
The course also asks for more than memory. You are expected to know key studies and to evaluate them: what they show, how they were run and what their limits are. A student who can recall a study but cannot discuss its method or its weaknesses will find many questions harder than they need to be.