Hi jasmine9,
If you are taking the exam this year, I would recommend choosing the Premiere Pro 2025 version.
You do not necessarily need to downgrade to an exact version, but practicing with Premiere Pro 2025 or another recent version is probably best since the UI and workflow will be closer to the exam environment.
The book you mentioned looks like a good choice because hands-on editing practice is usually more helpful than older theory-focused materials. Personally, I prefer the training videos on "LinkedIn Learning," but not sure if there is any Japanese content there.
Practicing editing, titles, transitions, audio adjustment, and exporting videos will help a lot.
Good luck!
Thanks,
Kevin