I find the best approach for revising is NOT Cramming the night before, you only end up panicking yourself and having a meltdown which isn't a good place to be in at 9pm the night before!

The most useful approach and which students agree on, is creating a time-line over your course time frame; for example, for Nazi Germany 1933-1945, you might like to start your timeline a little before, like 1918, (treaty of Versailles), so that you can give the period you are studying some context (background), in order to help you visually see how Hitler was able to come to power.

I also recommend colour coding - e.g. green for events, red for persecution, blue for Nazi response, yellow for opposition etc. The importance of seeing the whole of the topic you have been studying for the last year laid out all together, can be a really strong visual prompt to help you make sense of the whole timeframe, rather than seeing each section you studied as isolated episodes.

When you study history over a time frame, the focus is on change and by being able to see the change visually, over the time period your course covers its such a fantastic way of bringing everything together. This is what I would advise you to have a go at making in the run-up to your exam, so that the night before all you have to look at is this one timeline (be warned your timeline may well take up quite a few sheets of paper, but just glue them together!) instead of a whole years worth of notes, because all of your information has been condensed into one easy to read, accessible, visual timeline.