you really have no idea as to which questions are going to come up, it's good to do an essay for each topic for practice so that in the exam, you just have to remember what you wrote and you won't find it as hard.
You have to be able to understand all the studies and all the topics. You will not be able to know what questions will come up. But for psych 1 there are always questions on wmm/msm as seen all the old past papers. So learn the working memory model and multi-store model really well for that. All you can do is revise a lot then do a good amount of past papers to help you with the sort of questions that may or may not come up. If you do some past papers in a set time show them to your teachers so that they can mark them for you!