HIstory beginnerWatch this thread
Given that there is a lot of history; which probably means there's infinite amounts you could need to know, it would help if you let us know what Spec/topics you will be studying.
No additional knowledge is required, just pay attention learn in lessons and study hard. If you don't understand anything ask me, but for me the key was to keep revising because you start to understand certain concepts/themes more . Also act on your teachers feedback when you do essays