the objectively best way? read THE book. absolutely nothing that's not on that book will be tested. it took me 1 full day to finish the book, and i'd say that reading it once was enough for me to get 20/20.
shortcuts? i'd advise against that. but if you just don't want to read the book, there are a couple of youtube videos you can look up that contains ~500 sample questions and is ~4 hrs in length. you might need to pause and take notes or whatever, so i don't really think it's that time-efficient compared to just reading the book. Also these videos don't cover everything and people still say they encountered unseen questions in the test after studying from the videos.
also there's an app if you search for "canada citizenship test", and you can pay 6 dollars for a week of membership to use their material and test questions, which are kinda similar to the youtube videos.
honestly, just read the book first. you can definitely finish it before your test window date. and then if you want, check out these other resources later.
