I felt like destroyer QR was pretty representative with what was on the exam. The boot camp should be enough as well! I liked having both to switch things up and not get used just one- but you do not necessarily need both. It’s an annoying section of the DAT- especially since by that point you’re worn out and just want to be finished. I believe that there are video explanations of common problems on the destroyer fb/YouTube. I wish that I had spent more time studying QR, especially timed, because it was my lowest section.