Advanced Subsidary is AS, A2 doesn't actually have a name as far as I know. Essentially just Advanced 2. And you haven't got the system wrong :)
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History, RE and ICT
Never ever pick RE!!!
Yeah, I thought it meant that Shar,
I didn't really have an idea to what the AS stood for, might have been Actual somethingorother
It was harder than I expected at first. When my teacher at GCSE said it was a big jump to A Level, I didn't really take any notice :P. So I wasn't doing that well at the start of the year, but if you just make sure you revise a lot (something I'm not used to!) then you'll be fine. I found examsolutions.co.uk really useful, and I'd do past papers and then mark them, and for the Qs I got wrong I'd look at the video on that site. So yeah, that's how I revised for maths :D.
From what I've heard, computing is a worthless A level. You don't need it, or gain anything from taking it when it comes to applying to any degrees. Honestly, I wouldn't waste your time with softer degrees, universities will look down on you for it. There is a lot of competition now and intellectual snobbery has always been rife in academia.
Before you get too hung up about the requirements of one university, check a few (around 5?) and look at the requirements. If computing is required by one but weakens your position with the other 4, you have to be sure of two things:
1) You want to go to this university
2) You can get in