The tech quiz is pretty easy - I did very minimal prep for it, and we all passed; most having not used their native tongue.
Be aware, if you are not current on any type, (even if you were current when you applied) you are wasting your time, as we discovered in the course of my interview; Not that I was complaining as I subsequently lounged by the pool at their expense. All round, we were very well looked after indeed, and whatever the merits or otherwise of QR, the selection process leaves a good impression.