A couple of other titles from the same auther would suggest her writing isn't really at the required level...
Let's Get Ready for Hanukkah
Let's Get Ready for Kwanzaa
Having no great desire to be ready for either of the above, I suggest an Amazon search for "ATC" and "air traffic control" and, if looking at the UK, ignore the American books. The usual recommendation is for
United Kingdom Air Traffic Control: A Layman's Guide: Dave Graves: Amazon.co.uk: Books
With luck, a recent recruit will answer with up-to-date info. Those of us who joined NATS in the 90s or earlier aren't really current on what's out there for newbies!