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A Parent's Guide to the 11+ by John Barber.
How your child can achieve success in the exam by preparing sensibly; with you engaging with the system and overcoming the obstacles, working with your child and helping your child to maintain a good life balance; yet upholding ideals of education and social justice and not having to spend lots of money!
John has kindly provided an abridged version for free which you can download here. The full version can be bought for in Chuckra's online shop.