HI inthename:
I'd look in your region on the eleven plus forum: www.elevenplusexams.co.uk
DD1 passed for a grammar from ordinary comprehensive - no tutor but we did a little each week (2 hours games/ practise really Thurs evenings + weekends and extra reading nightly)...
free rice: freerice.com/#/english-vocabulary/1389
How many words can you make: www.eastoftheweb.com/games/Eight1.html
CGP literacy workbook Year 5 (lots of grammar/ spelling rules)
bought the set of children's classics from The Book People & read them (either DD1 reading to me or me reading to her) - discussed vocabulary (meaning of words/ word choice) & plot.
Bond 10 minute quizzes (we have all NVR/ VR/ Maths/ english here - so we did 2 each a week across a week).
NRICH maths puzzles: nrich.maths.org/frontpage - upper primary
mathsfactor (we finished arithmetic school & started algebra school).
If your school subscribes to My Maths: play the games + work through NC Level 5 library (we did this gently over the summer).
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by stealth:
High quality tv documentaries: science/ history/ nature/ etc....
Museum visits
Historic Houses
Theatre trips
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On practice papers (which we did in the summer before the exam) - I used to add up all 4 subjects/ divide by 4 and multiply by 300 (notional possible perfect score) for an approximate score. And that more or less was spot-on for the actual score.
Don't go mad and sign up for on-line things - they loose interest.
Don't make it a battle. Explain why you think it's important but let it be their choice.
Do give them rewards for great scores or lots of good work (trip to the park/ ice cream/ tv or video game time/ movie).
Don't make it the be all and end all - there's no guarantee they'll pass.