I would like to share my sad experience in EW selection:
First of all i didn't get it, unfortunately, and the most frustrating thing is that I passed every step except the last one: the CQ.
Guys, this is the toughest conversation I really had in my life. They are doing non-sense questions (of course, there might be a reason if they ask those), and despite you are going there enthisastic and prepared to talk about yourself, etc. , they try to push you hard in only talking about negative things about your life or yourself.
For example: you why did you take longer for taking your degree (that is absolutely not a requirement), why did you quit this job , are you really sure to become a pilot, etc.
Maybe they are going to test your resilience, and see how you react.
Anyway the interview was too much focused in depth about my background (they might not have like it), and nothing concerning aviation related questions.
Apparently this is the toughest phase despite the BQ and the Sim.
I wish you best luck