Thanks Cisco316!
I really liked the discover Canada online version chapter and did not like the pdf version which is difficult to scan.
I reviewed each chapters more than 10 times and highlighting keywords in each chapter.
The free tests are good. If you google citizenship free test there are so many of them all of them. once you are done any test try to mark those questions in the text book those free test will assist you to get grip on all chapters in the book. use online tests as tool to get super grip on the discover Canada.
Eventually you will reach a point where just by clicking on online chapter in discover Canada and looking away you would be visualize the entire chapter the sentences, keywords, photos, colors etc and will be able to draw a map of whole discover Canada.
During interview , officer will go through physical presence form and will verify each stamp. Please know the all travel dates and corresponding stamps in your passport. He asked me to show them and also the reason for travel. If you are prepared only takes minute. quick to the point answers, quick interview.
Good Luck!