Hi, thanks for your reply, but I did already know those, although I admittedly failed to specify what I meant.
For example, Oxbridge normally ask for A*AA, but I have little to no chance of getting in there - it's more like A*A*A*Aaa or something academically unachievable for me.
What I meant was that am I likely to get in realistically, even though I exceed the entry requirements, am I actually likely to get an offer?