Heya,
i know how you're feeling psychology is pretty darn difficult to revise but there are ways of doing so stay positive my dear.
personally, I find holah the website to be a life saver when revising approaches as it provides you witht the assumptions as well as the strengths and weaknesses for each one.
repetition is the best way to get something stuck in your head so write down the approach with pros and cons over and over until your dreaming about it
How about comparing the approaches to each other once your done and seeing how effective they are compared to the other assumptions.
POSTERS AND REVISION CARD WRITING OVER AND OVER IS MY ADVICE, AND STAY POSITIVE