George,
I attended a walk-in interview and there we did a surprise 50 question tech quiz, most of it common sense stuff and nothing you can really study for. With your experience I wouldn't worry. I think the required passrate was 80%. After that it was a quick chat with two pilots, simple get-to-know-you stuff, all very friendly. A week later it was a simulator check ride in Doha. Take-off, engine failure, VOR approach to land. That's it. Also very friendly.
I guess you will apply for an F/O position. Judging by other posts, it might be a tough job, but at least it keeps you flying, and whatever rating they give you will be great for later.
Good luck!