Ozavatar, I have a couple of friends that are lucky enough to have jobs with Qlink and this question has come up in our conversation several times. They say the best thing to do with regards to the sim is nothing at all. Review all the power settings and VFE, VGE speeds etc but don't go out of your way to find a dash or airbus sim such as the one on the Goldy. Reason is they look for your ability to learn and improve in the sim exam. The theory goes if you play with a sim and get used things it will appear that your performance will be pretty flat rather than stedily learning as you go along.
In my situation the Qlink program is very very appealing so if your successful or not I'd love to hear what the current testing consists of if you have time to PM me.
Best of luck with it mate.
Rocket