Recommended by a tutor to us. It really helps for 11+. A bit harder than the ones you wold find in the shops but better for them to practice these. We did all these books for both our children and they both passed their 11+.
Like the red book from the Walsh series, it contains four practice papers and answers. I treated this book as a continuation after my child has finished the first (red) book. He learnt some new words and was exposed to more mathematical problems. Highly recommended.