Well there's no mid to high chance of interview.
If you get over 93% UMS at AS in correct subjects or top three for arts then you'll definitely get an interview.
If you have above 90 you have a good chance.
Above 85% is the mid chance if you wanna put it like that.
Below is very low unless you have ECs.
GCSEs don't really matter, average is probably around 6 A*s and mainly As, but people get 12 so by same merit, people get none and get in.
A2 Predictions would be at least a*aa but not having that won't cut you out completely because they have your scores.