Need advice!!!

My UCAT is on Saturday and I'm really struggling. I'm averaging 750 on QR which is great but my AR is so low. I did an official mock yesterday and got 510. Can someone please help me as It seems I just cannot spot the patterns as my brain is much more maths/science based than it is anything visual. However, I also found that when I doing AR practice sets im doing fine (about 36/50) its just when it comes to the mocks I struggle, could that be because it is the last section and my brain is less engaged? If that's the same for anyone else could they please let me know how they overcame it? Thank you