I did a different exam board but I got an A* in History last year. I was Edexcel.
The way I revised history was I read through the book, or just used summary sheets provided to me by my teacher. I hated writing notes. Rather than writing essays (which would take so much time) I just looked at past exam questions and prepared essay plans.
This way I knew what vague themes I could use depending on what question came up (obviously if allowed by the sources given). I'd really pay attention to essay structure, as that can make or break your essay, regardless of whether you all the facts.
So to summarise; I read/highlighted summary sheets/the book. I made essay plans on questions that have come up, and possible questions we had to do for homework. I made sure I knew the essay structure for each question, and how to answer the question.
Any more questions, just ask/pm me.