Workman01
There could be several variants of the initial tests - that does not mean that someone might get an unfair advantage - the papers will all be of a similar level of difficulty.
You can either do it or you cannot - what someone else may or may not have been asked does not have any bearing on your individual effort.
If you are succesful and commence ATC training, be prepared for many exams (especially Oral boards) where people at the same stage as you get asked totally different questions... the point is that the standard required from the examiners and the examinees will be the same across the board.
Amentohep et al have been gracious in their bid to enlighten people as to the format they can expect, but I have a top tip for applicants - possibly the best tip you will receive.
Read the paperwork you print off i.e. the motivation paper and learn it. and read the other information you are given.
A neighbour returned from stage one testing in London yesterday and they were incredulous that 4 or 5 of the candidates had not even done that.
Learning that paperwork aside - you can either do the tests or you can't... training your brain (or jump starting it) by doing IQ books, puzzles etc is a good idea IMHO, but it only serves to get your brain back up to speed if you have not used it that way for a while.
If you have never had the aptitude to do these sorts of tests, then you probably never will.
As long as you give it your best shot, thats all you can ask of yourself and its all NATS can ask of you (and that stays true throughout your training)