super jumbo
Hi super jumbo,
I wouldn't worry about still being at university, I suppose if they've called you for the selection then they are not worried about it. However, you might want to ask yourself if its the right timing for you. A degree could be invaluable in the future.
As for the tests, its almost impossible to get the ball round the track more than a few times without making an error, so don't worry too much about it. Sometimes you do better than you expect!