The book presentation itself is actually really easy!
1. This book was written in the last 10 years. Its called ... by ...
2. I like this book because ... From this I can use it to teach ...
3. It has good cross curricular links to ... which can also allow me to teach ...
The interview itself (from personal experience) was all over the place. They ask you about one topic, move on to the next then go back to more questions about the other topic. The only tip is to be prepared for some bizarre questions. Like, i was asked about Boris Johnson and what i would discuss with him education-wise if i had a chance.
As for the written task, i honestly i have no idea. I remember the other applicants and i were so lost and just ended up handed in whatever.