I did the AS AQA biology specimen as a mock today, (different exam board, I know) but I agree that the layout was so different! I am so used to being terrible on exams because I understand the content but the application of knowledge in the hundreds of suggest and data interpreting questions throw me off completely but this specimen was so different. It was about 85% memorisation, 2 maths questions and a huge comprehension with a three marker, 3 two markers and a one marker at the end.
It was too easy so I have my suspicions that the next mock on Monday's paper 2 is going to be more data-based.
Have you done the recently released OCR chemistry specimen papers? I can't get hold of them anywhere!