"Handling the big jets" dont know the author and have not read it myself but believe it gives an insight into moving onto the jets from turbo-props and pistons. Transair and other pilot shops will stock it.
If you are invited for aptitude tests then there are some books,"How to pass Maths test", "How to pass english tests" and "How to pass aptitude tests" they cover number sequencing, word association and technical problems most big book shops will stock those. Maths one is good tells you how the number sequencing is made up.
Also dust off your ATPL notes read up on P of F, Aircraft systems and engines.
You dont want to get a lucky break of selection then blow it due to not being prepared. Been there and got that t-shirt!!