No numeric patterns when I did the tests ..... but that was nearly a year ago.
Wear a suit for goodness sake - it requires so little effort yet it may count for much, who knows? Anyway, do it!
I'm sure we were given some paper to do rough calculations on but it had to be handed in with the answers. Thats to stop you copying examples of questions and taking them out with you!
I specifically asked about negative marking from the (non-BA) chap administering the nuemrical tests - he said there was definitely NO negative marking. I didn't attempt to guess any answers as the end time approached, I just worked methodically and tried to get them right.
Something paid off ..... because I am now very lucky to be flying the B777.