Hi
I've practised mental maths (especially long division and ratio's) and a few numerical reasoning tests.
I've made a collection of examples from my previous and current work to common competency interview questions (Communication, Leadership, Problem Solving, etc).
As for the aptitude tests, I've familiarised myself with the types of tests but I will just leave it for when it comes. I will either have it in me or I won't.
At the end of the day, it will be a great experience and even if I am unsuccessful, I will have taken a lot home from it.
You can only do your best.