What has school told you are her current levels in reading, writing and maths? Were these based on work throughout the year, or tests, or both? What were her CAT scores? What were her KS1 results?
When you say she did badly with the tutor in the past and you gave up, what sorts of things was she doing badly on?
What was the mock paper the tutor gave her on which she got 15%? Do you have a copy of the questions and her answers to see where she went wrong?
Sorry about all the questions - but trying to see where the clue to the mystery lies - with the school, the tutor, or your daughter!
I can't remember her exact CAT results, we weren't given them just shown them at parent's evening but they were high, her results were among the highest in the class, even in Maths which was gob-smacking. She is in a particularly high acheiving class too. Her KS1 results were high average. We do have the paper where she got 15% - no answer unfortunately. We got her to finish the paper off and she got a further 7 correct so that would still be much lower than 50%.
Thanks for your reply and sorry it's taken me so long to respond, have had a manic few days.