Use your mock results to push your study habits further to achieve those grades for AS levels you want.
I'm confused don't you get predictions for uni in early year 13? I got BCDD in my AS level mocks, but got AAAC in my final AS Levels. I tried my best to redress the situation and that helped me in my year 13 predictions.
Its hard in your first year of A Levels trying to grasp the work and the academic level you're now working at, but you can do it!