Radio is not what keeps you in the air, the Wright Flyer never had one. It is an aid that makes flight safer and more efficient by letting you share intentions with air traffic services and other pilots. That framing matters, because it tells you what to do when the radio gets busy or fails: fly the aeroplane first.
There are really two things to pass here. The Communications written exam tests the knowledge in this guide. Separately, the FRTOL (Flight Radiotelephony Operator's Licence) is earned through a practical test where you actually make the calls. This guide builds the knowledge; the phraseology only truly sticks once you say it out loud, so read each call aloud as you go.
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