How to revise History?Watch
Also, revision cards with key dates / events and brief information. Making yourself recall information is the best way to learn.
For AS Level I made an interactive list of events and the year their occurred in, in chronological order and learned as many as I could.
Other than that, essay practice.
Have you got history textbooks? If so, just read them and don't think of it as studying (that kills the vibe), just think of it as reading a mystery novel, or thriller, or whatever genre the time period matches.
Lucky you, you're only doing two topics . I'm doing Elizabethan England, the Cold War, Germany before and after WW2 and Medicine through time
Best of luck!