I'm newly registered too but as a parent and teacher at an independent school with responsibility for entrance exams (Grammar and independent) I have a few tips for you:
TB is right - it is better to learn all the techniques (particularly VR & NVR) before attempting whole papers. It will also ensure that she does not peak too early or tire of the process.
No-one can give you exact percentages - it depends on the particular cohort that is sitting in that year. A 'pass' is not a guarantee of a place. As a rule though your daughter should be getting 90% and above for Grammar school entry.
For details about exams at particular schools and papers used look here: http://www.elevenplusexams.co.uk/school ... ey-11-plus
I would suggest also that you use a greater range of materials.
My most successful pupils have been those who have read a wide range of books (at least 2-3 per week) this helps build vocabulary for English & VR as well as the ability to read and understand problems in all disciplines. Look online for reading lists for Year 5/6.
Hope this helps.