I would go for it. I dont think GCSes are the major factor in whether or not you get in. I got 9A*s and 3As and got rejected from Oxford and someone at my college got 11A*s and got rejected but I know other people who have similar results to you and have been accepted. It all depends on who is interviewing you and whether you've got what they're looking for. Just go for it. There's no harm in trying.
A friend of mine just graduated from Cambridge and he got in with 2 A*s, 3 As and a bunch of other grades, but 4 As at AS, and 3 As and a C at A2. He was doing Computer Science.
what's the average cambridge admission score if you want to study economics and marketing or something like that and what are the chances of getting into oxbridge if you dontget any a*'s but do get a lot of a's??
... there's no economics and marketing at cambridge... it's Economics although you can do your final year in management...
i dont think there are stats about the average GCSE grades for each degree... but overall it's 6A*s.
I personally would not say that getting As instead of A*s would be a major factor... although getting A*s in Maths and Economics would help obviously...
I dont think the "chances" of getting in would vary considerelly (sp?)