Hey All,
Having done the BQ test I would say that the most important things to study are the mental math and math word problems on the sky test program. I used the sky test program designed for the DLR and it was more than enough. I had to relearn a lot of highschool math such as algebra, so it did take several hours of study for me to get up to scratch.
Sky test definitly helped me pass. About the memory and spacial reasoning, just practice it a bit but where most ppl failed was on the math problems, mental math and ATPL. The ATPL question consisted of several performance (V1, toda etc), MET, and a lot of random questions from the 14 subjects.
Food provided on the day, so no need to pay for breakfast at the hotel or to bring a lunch.. Good luck!