Keep on concentrating
Hi Guys,
Best advice I can give is to practive things like break-time puzzles in paper - helps to get your mind going.
The only other bit of advice I have is on the day - don't give up during the tests, just keep calm and do the best you can.
I have just passed the selection process (start in March) and still have no idea to this day how I passed - this is the common view amongst those I have met during the selection process...