Are you talking about how the content is being taught at school? Because if that's the case it doesn't matter whether the respondents are predicted A*A*A* or EEE. And obviously everyone's going to have to revise things at some point. If your question is, how many topics have I mastered, the answer is probably none.
The further maths course was finished, content-wise, by the end of the spring half-term at my school, having started at the beginning of year 13. With physics we still need to cover two-thirds of the astrophysics module and maybe the very end of the last chapter on nuclear physics. As for history, we've nearly finished both Tudors and Russia but there's still a moderate chunk of civil rights in the USA left.