As some of you might know, if you look about the AQA website, you can find a raw-mark to UMS calculator. This shows you how many UMS points you'll get for your exam results. It works for the mock exams, too!
You need (after collectively adding up your U1, U2, U3 and ISA UMS points):
360 for an A* 320 for an A 280 for a B 240 for a C 200 for a D
Now the interesting thing is, if you look at all the past papers mark-UMS score, you only need 36/45 on the U3 test to get full UMS (100). That means you still need to aim high, but perhaps not as high as you thought to do as well as you can!