A lot of people rely heavily on the practice quizes.I had my test on March 21, 2019 and I have studied for only 3 days. I have got 19/20. I fund reading book is more useful then quiz. Most probably 3 questions I have found from quiz. Which means other 17 questions was from the book and general knowledge. While I was reading the book I was saying why someone need to read the whole book, how many people will remember the whole book. But after I have realized that if I hadn't read the book I would have unknown about Canada. I have learnt a lot of things about Canada after I have read the book. I have been in Canada long time. I have finished study then worked as FW then waiting for applying for PR got PR like it tooks long time to apply for citizenship stil I was not aware all those things which I have learned from the book such as Canada's history and a lot thing. I wouldn't ever read the book if I didn't have to read it.
Everyone should read book to know about the country where we want to take oath and to stay forever.
Test taker need to practice few quiz to know how would be actual test quiz.
Good luck.
I am glad to find more and more people who emphasize on reading and studying from the actual book itself.