When I was applying to a bunch of airlines after finishing my integrated ATPL, I used this book to prepare myself for the technical questions (I had the first edition).

Written by an experienced airline pilot, Ace the Technical Pilot Interview, Second Edition is filled with more than 1000 questions and answers, many of them all-new. This practical study tool asks the right questions so you’ll know the right answers. It’s a must-have, one-stop resource for all pilots, regardless of aircraft type, performance, or global region. Buy it online: https://www.amazon.com/Ace-Technical-Pilot-Interview-2/dp/0071793860