What I (Personally) have found useful is watching clips of how to answer questions: I have a CD consisting of 136 Videos that last from as long as 15min to 1min long. I find it very helpful for revision, because I start with a Past Paper and any question which I even have a slight struggle or doubt, I find out the context and watch a video (practice questions in the video) then try the past paper question again before moving on. Good luck