Hey mate, I'm not exactly sure if you encounter any additional maths testing on YOU day specifically if you identify yourself as a Pilot candidate but from my experience of YOU sesh there is a maths test of about 15-25 questions at most that you do right after your GAT.
It's not very hard at all (as repeated many times throughout this thread). If you use maths and any kind of algebra in your everyday life as well as recall the foundations of Year 10 mathematics such as 3/4/5 triangles and which side of the triangle is the hypotenuse (which was a serious question that people at my YOU sesh couldn't answer during the testing) you should ace it. It is much easier than the maths in the link you've posted if that gives you an idea.