Law requirements

You would need to pull the fourth AS upto a B, or if you got an A at A2 in that fourth one, then the B at AS would be able to come from one of the other three subjects, if you see what I mean?

I mean they may let you in if they still have spaces after all of the people who have met their offers have accepted, however it would not be meeting the offer if you don't do as I described above.

Well i did some resits in January for the one that I got a C in at AS Level, but I aggregated my C at AS. So if the grades I get bring my fourth AS up to a B, will it matter that I already aggregated it at C?

If I were you, I would query the offer. If you're doing four A Levels then you can't get AAAb. They should have made you an offer based on 4 A Levels or only 3 A Levels. Ring them up and ask them to verify what they want from you.

Yes you can.

How can she get AAAb? Unless there is a fifth AS Level which I've missed? She can get AAAB, thereby exceeding the offer, or she can get AAAC or AAAD which might be the equivalent to AAAb in terms of UCAS points, but the offer isn't made on UCAS points.

She got AAAC at AS. She can push that 'C' AS up to an 'A' at A-Level, and use one of her other AS grades as the b.

Or she can re-take a module in the 'C' grade AS.

But she's doing all four to A2! On results day she won't have any AS Levels on her certificates - she'll have four A2s. So as I said above, she can either exceed the offer by getting AAAA or AAAB, or she can fall short of it by getting AAAC.

I think it's still likely that they'd let her in with AAAC. But I just think it's very sloppy to make an offer based on 3 A2s and 1 AS when the candidate is clearly doing 4 A2s.

That's irrelevant. Mod 1, 2 + 3 = AS grade. Yes she'll have four A2s, but she'll also have 4 AS grades (what she achieved in her first year at college).

And how do you know that she hasn't got her AS certificates anyway?

Even if you cash in your AS Levels and get certificates, they don't mean anything if you take them to A2 ... you don't have 4 A Levels and 4 AS Levels at the end of it all ... you just have 4 A Levels!!

Can't be arsed to argue the point with you anymore, it's really just a technicality, but as I said I think it's sloppy and the OP should seek to clarify it with KCL.