Gosh, thank you Tolstoy! It's very reassuring to hear how someone else has tackled the tutoring. Your post makes me think that perhaps I have more time than I thought and that I should take things very slowly to begin with. A rather large part of me (the seriously panicking part) wants to make DD do an hours work a night for the whole of this year but the small sane voice in my head says "No! Leave that child alone!"
(and the other voice says "go on, get her out of bed, she needs to learn her 13 times table and the alphabet backwards")
I like the idea of using the Tutors dailies and of doing mock tests with 2 papers back to back.
I think my biggest concern is DD not being able to keep up the speed or the concentration required for 2 x 50 mins. I am also concerned that while DD will most likely remain calm and laid back as always, her mother will be a paranoid raving lunatic with no hair by the time the exam is over.
I am going to print your post and add it to my big file. Thank you very much for taking the time to explain what has worked for you. I hope everything goes well for your DS2 on the day