The official book is called :-
Life in the United Kingdom: official citizenship test study guide (by stationery office)
You can buy at Amazon or Waterstones.
Plenty of online sites for practice sessions.
First time I did a practice test I failed.
But as long as you study the chapters indicated you will be OK
I'm not sure on the latest edition. There was one published 2010
Waterstones will be able to advise you.
