I found 'ace the tech pilot interview' good but with some, very few, inaccuracies. For interview prep I found 'checklist for success' by Cheryl Cage great as it gives loads of questions to ask yourself, styles of interview techniques, do's and dont's and advice on how to sell yourself etc. I was told theres just as much emphasis on "would I want to be flying with this person?" as there is technical knowledge, so if you don't know the answer don't blag it, you won't do yourself any favours, be honest.