I brought this book for my 10 year old as she had a test at a selective grammar school for 2010 entrance.
We were having problems understanding the codes, sequences and rules that applied to Non-verbal reasoning. This book was recommended by another parent.
I ordered the book on amazon prime, it came within 24 hours.
We had 6 days to use the book, learn the technique of NVR before the test.
This really helped, she was able to complete her test with ease.
Only wish I'd have found it earlier as i had to give her intense coaching of 3 hours per night to complete each section.
A recommended buy!