If you know the topic properly, you'll pass the exams.
If you want to find a short-cut, good luck to you, but you'll be found out later in your 'career'.
Most of these daft books are about learning the short cuts without studying the topic.
/Rant ON
Air travel operates as it does now because of ICAO. Without the Freedoms we would not fly as we do. Without Chicago and the Annexes we would not fly safely.
Do credit to the folk who sorted this out with blood, sweat, and tears, and at least humble yourselves enough to find out about it...
...because none of you will ever, ever, achieve anything like what they did...
/Rant OFF