You cant study for it
Cobra, the whole point of the cognitive test is to test your raw ability. The ADF has been using them for decades and as I was in the ADF for a while I can tell you they are pretty accurate. You cant study for it so to speak. Talking about it on a PPRUNE forum isn't going to give anyone an advantage over you.
These tests will be done by everyone who has the minimum quals set by Virgin on the website. Don't think your special because you made it to this stage because literally hundreds of people will be doing this test. The culling will begin once everyone has tested and face to face interviews begin. I would say that for six cadets they may interview 40 people.