@Barbarella35 , my DS is in Tiffin Y9 and I coached him for both English and Maths 11+. No tutoring. He also passed the Sutton exams and was invited to apply for a place in a 3 Sutton schools including Wilson. I have a strong maths background, single mum, and I prep him from Y3 just to avoid the stress for both of us. I first focus on completing the Maths National Curriculum by the end of Y4. In your case, what you need to focus on is to ensure your DD has firm grounding on all Maths topics instead of prepping for a particular entrance exam. Therefore, practice books by Topics are best. DS practiced questions targeting GL / CEM and those targeting for private school entrance exams. I pretty much tried all publishers mentioned by parents on Mumsnet! Bond is my least favourite. Eventually, I stop using it. CGP is good to build the foundation and is the easiest (for my DS), I also used Schofiled & Sims and First Past the Post.
Each publishers have their own style of phrasing a question and level of difficulties will be different. Hence, they need to start working on questions from the easiest and build it up to the hardest for a topic. Not in 1 day thou! This way, you are building up their confidence. I chose to prep him this way to keep him on his toes. I believe DS will be able to stay calm, analyse and think how he can answer questions starting from first principle if the questions in the actual exams may be something completely different to anything he has seen.
Example: In Y3, he will practice Topic on Fractions that target Y3 standard. Once he is fine with Y3 standard, I gave him Y4 Fractions questions to practice. If he is good at it, I gave him Y5/Y6. Along the way, I will teach him more efficient way of solving a question after he finished the practice. Then I will pick up questions relating to Fractions from those "10 mins" practice books for him to try.
I did not have a strict rule that he has to spend 1 hour each day / week. IMO understanding the topics and practice to achieve accuracy are the most important at this stage. Often I only asked him to complete half a page questions for a particular topic. Once he is done, its done for the day.
Y5 Maths - this is all about practice exams papers. Up till end of March is not timed but again focus on accuracy. Post-March its timed so to work on speed and accuracy. 2 months prior to actual exams, he practiced Tiffin/Sutton mock papers to give him some familiarity.
English - He reads ALOT and very wide range of genre. I never test him on spelling, or test him in any way. However, I will always ask him "Tell me about this book you are reading / Who are the main character / Describe your main character to me / Do you enjoy this book? If not, why not?" Y5 English - he started working through books that covers Grammar, Vocabulary, Cloze and Comprehension in addition to timed exam papers. No flashcards, no memorising list of words etc.
2 weeks prior to his first sitting, he stopped working on any papers. I asked him to chill and watch Netflix and stop thinking about exams. 4 weeks before first sitting, I coached him on exam techniques and time management. For all his prep, I always teach him to go back to his first principle if he is stuck on a question. Spelling - phonetics.