No worries! Yeah, sorry I didn't phrase that very well, I meant I know people who have gone up by a grade overall without retaking anything from AS, so it can work that way for some people. It would be very difficult to improve your end result by more than one grade without retaking anything, but obviously those who do can come out with much better results than they did on the first attempt
The only one of those I know a bit about is Psychology (my sixth form does AQA) - at A2 apparently there is a bit of a step up and the exam questions become a lot more essay based, with more assessment objectives than at AS, but I'm not too sure about the actual content...
It's great that you've managed to get a fair bit done already, this will definitely come in useful at the beginning of the year! What course and universities are you hoping to apply for?
Yeah I did get all of my offers - Bristol, Exeter, Nottingham, Cardiff and Reading to study Zoology. I chose these because their versions of the course looked the most interesting, and I aimed to have two with a high offer, two slightly lower and one as a backup (Reading). In the end I chose Cardiff, even though it's not as high in the league tables for biological sciences as some of the others, because I just preferred the location and the general "feel" of the uni when I went to visit - they were very helpful and accommodating in terms of what I wanted to do with my degree, recommending final year research project topics etc, and I just got a much better overall impression from them than I had from some of the others.
I think the subject content is definitely more interesting at A2, or at least it was for my subjects, but I think that was just because of how the different topics were organised into the units, rather than the step up from AS. And personally I like to start right from the beginning, revising and consolidating things as I'm learning them, so your plan of making notes from the start and stepping it up after Christmas sounds good, just as long as you're including lots of detail and reading back the notes as you go so that when it gets to Christmas it's all pretty familiar to you
Good luck!