Hi,
Remarking is an option but your teachers will be able to give you more accurate advice because they know what you're capable of. Do you think you should have got higher marks? Compare what you got in the actual exam to the practice ones you did, and if the exam looks lower than expected, you could consider it.
However, remarks can potentially go down and since you've already got high B's, it could be a risk and you could instead try to get extra marks at A2 instead. I know for English Literature AS I was a few marks away from an A (I got something like 154/200 and it was 160 for an A) but my teacher advised against the remark. Instead I decided to resit and today I came out with an A* for the overall A Level and I think resitting the exam was the better option. But someone with a better knowledge of the History course might be able to give better advice, I'm just going from what I've experienced in another essay subject.
- Jack