It's hard to say at this stage. My friend and I both achieved ABBD at AS, yet she had 5 A*/6 A at GCSE, and I have Dist/4 A/5 B at GCSE. We both did two sciences, maths and another subject.
It'll be easier to tell maybe around Christmas, but even then it'll be misleading. My target grades were BBCC in Sept, got BDUU in Jan mocks, had targets of ACCE at April, and then got ABBD.
Try your best, get the highest mark you can, and then think about predicted grades when you start A2.