Just as a summing up, as this will be my last post on this subject, but I was given several sheets of alpha-numeric BA questions by a colleague who had left the military. He was subsequently successful in his application to BA. The information he had available had given him a 'heads-up' on about 90% of the questions. He also had available info on sims and interview questions. I didn't use the information but passed it on to a non-military applicant who subsequently found the testing a breeze.
My belief is that it was all done unofficially and was passed around between colleagues at the base.
Organisational skills at it's best.
I applied to BA in 1990, didn't get in (unfortunately) and is the last time I applied.
Useful tip gleamed for the numerical reasoning - there are a couple of questions that are deliberately created to slow you down. Miss them out and carry on with the rest and with the time available you will get sufficient marks to pass the test. Even if you have missed a few out.