History a level courseworkWatch
Think of something you enjoy. You can find historiography for almost everything though it's worth noting that topics that involve events such as WWII or anything to do with the British Empire (essentially 'big events') will most likely be easiest to research.
Definitely ask your teacher(s) what they specialise in. There's no point in doing your coursework on Mao Zedong if your teacher knows nothing about him.